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Document And Entity Information - shares	6 Months Ended
Document And Entity Information - shares	Jun. 30, 2017	Jul. 28, 2017
Document Information [Line Items]
Entity Registrant Name	ICF International, Inc.
Entity Central Index Key	0001362004
Trading Symbol	icfi
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding (in shares)		18,734,799
Document Type	10-Q
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2
Amendment Flag	false

Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current Assets
Cash and cash equivalents	$ 9,493	$ 6,042
Contract receivables, net	288,178	281,365
Prepaid expenses and other	13,278	11,724
Income tax receivable	5,325
Total current assets	316,274	299,131
Total property and equipment, net	37,881	40,484
Other assets:
Goodwill	685,071	683,683
Other intangible assets, net	40,692	46,129
Restricted cash	1,254	1,843
Other assets	16,874	14,301
Total Assets	1,098,046	1,085,571
Current Liabilities
Accounts payable	60,734	70,586
Accrued salaries and benefits	40,793	44,003
Accrued expenses and other current liabilities	44,540	52,631
Deferred revenue	27,113	29,394
Income tax payable		106
Total Current Liabilities	173,180	196,720
Long-term Liabilities:
Long-term debt	278,000	259,389
Deferred rent	14,983	15,600
Deferred income taxes	44,439	39,114
Other	14,314	8,744
Total Liabilities	524,916	519,567
Commitments and Contingencies (Note 8)
Stockholders’ Equity
Preferred stock, par value $.001 per share; 5,000,000 shares authorized; none issued	0	0
Common stock, $.001 par value; 70,000,000 shares authorized; 21,920,299 and 21,663,432 shares issued; and 18,717,713 and 19,021,262 shares outstanding as of June 30, 2017, and December 31, 2016, respectively	22	22
Additional paid-in capital	300,394	292,427
Retained earnings	394,004	371,890
Treasury stock	(114,122)	(88,695)
Accumulated other comprehensive loss	(7,168)	(9,640)
Total Stockholders’ Equity	573,130	566,004
Total Liabilities and Stockholders’ Equity	$ 1,098,046	$ 1,085,571

Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Jun. 30, 2017	Dec. 31, 2016
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized (in shares)	70,000,000	70,000,000
Common stock, issued (in shares)	21,920,299	21,663,432
Common stock, outstanding (in shares)	18,717,713	19,021,262

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue	$ 306,392	$ 305,419	$ 602,687	$ 589,018
Direct Costs	190,896	194,188	374,503	371,387
Operating costs and expenses:
Indirect and selling expenses	86,240	84,641	175,042	166,200
Depreciation and amortization	4,299	4,084	8,818	8,103
Amortization of intangible assets	2,749	3,148	5,483	6,276
Total operating costs and expenses	93,288	91,873	189,343	180,579
Operating income	22,208	19,358	38,841	37,052
Interest expense	(2,537)	(2,460)	(4,488)	(4,905)
Other income (expense)	226	(57)	335	218
Income before income taxes	19,897	16,841	34,688	32,365
Provision for income taxes	7,960	6,258	12,574	11,891
Net income	$ 11,937	$ 10,583	$ 22,114	$ 20,474
Earnings per Share:
Basic (in dollars per share)	$ 0.64	$ 0.56	$ 1.17	$ 1.08
Diluted (in dollars per share)	$ 0.63	$ 0.55	$ 1.15	$ 1.06
Weighted-average Shares:
Basic (in shares)	18,775	19,008	18,840	19,001
Diluted (in shares)	19,086	19,293	19,252	19,320
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax	$ 2,100	$ (2,026)	$ 2,472	$ (2,943)
Comprehensive income, net of tax	$ 14,037	$ 8,557	$ 24,586	$ 17,531

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash Flows from Operating Activities
Net income	$ 22,114	$ 20,474
Adjustments to reconcile net income to net cash provided by operating activities:
Non-cash equity compensation	5,361	5,042
Depreciation and amortization	14,301	14,379
Facilities consolidation reserve	1,663
Deferred taxes and other adjustments, net	4,383	1,768
Changes in operating assets and liabilities, net of the effect of acquisitions:
Contract receivables, net	(4,203)	(27,158)
Prepaid expenses and other assets	(2,978)	(10,650)
Accounts payable	(9,953)	(4,147)
Accrued salaries and benefits	(3,375)	18,336
Accrued expenses and other current liabilities	(8,876)	(827)
Deferred revenue	(2,658)	2,182
Income tax receivable and payable	(5,441)	(2,311)
Restricted cash	597	(3)
Other liabilities	6,307	(1,348)
Net Cash Provided by Operating Activities	17,242	15,737
Cash Flows from Investing Activities
Capital expenditures for property and equipment and capitalized software	(6,083)	(7,856)
Payments for business acquisitions, net of cash received	(91)
Net Cash Used in Investing Activities	(6,174)	(7,856)
Cash Flows from Financing Activities
Advances from working capital facilities	348,975	259,215
Payments on working capital facilities	(330,364)	(252,843)
Payments on capital expenditure obligations	(2,276)	(2,020)
Debt issue costs	(1,489)
Proceeds from exercise of options	2,431	1,158
Net payments for stockholder issuances and buybacks	(25,253)	(10,695)
Net Cash Used in Financing Activities	(7,976)	(5,185)
Effect of exchange rate changes on cash	359	405
Increase in Cash and Cash Equivalents	3,451	3,101
Cash and Cash Equivalents, Beginning of Period	6,042	7,747
Cash and Cash Equivalents, End of Period	9,493	10,848
Supplemental Disclosure of Cash Flow Information
Interest	3,923	3,804
Income taxes	$ 12,982	$ 12,059

Note 1 - Nature of Operations and Basis of Presentation	6 Months Ended
Note 1 - Nature of Operations and Basis of Presentation	Jun. 30, 2017
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	NOTE 1 - NATURE OF OPERATIONS AND BASIS OF PRESENTATION Nature of Operations ICF International, Inc. and its subsidiaries (collectively, the “ Company”) provide professional services, including management, technology, and policy consulting and implementation services, to government and commercial clients that operate in four key markets: energy, environment, and infrastructure; health, education and social programs; safety and security; and consumer and financial. The Company offers a full range of services to these clients throughout the entire life cycle of a policy, program, project or initiative, ranging from initial research and analysis, to design and implementation of programs and technology-based solutions, including the provision and delivery of engagement services and programs. The Company ’s major clients are United States (“U.S.”) federal government departments and agencies, most significantly the Department of Health and Human Services, the Department of State, and the Department of Defense. The Company also serves U.S. state and local government departments and agencies, international governments, and commercial clients worldwide. Commercial clients include: airlines, airports, electric and gas utilities, hospitals, health insurers and other health related companies, oil companies, banks and other financial services companies, transportation, travel and hospitality firms, non-profits/associations, law firms, manufacturing firms, retail chains, and distribution companies. The term “federal” or “federal government” refers to the U.S. federal government, and “state and local” or “state and local government” refers to U.S. state and local governments, unless otherwise indicated. The Company, incorporated in Delaware, is headquartered in Fairfax, Virginia. It maintains offices throughout the world, including over 55 offices in the U.S. and more than 10 offices in key markets outside the U.S., including offices in the United Kingdom, Belgium, China, India and Canada. Interim Results The unaudited consolidated financial statements included in this Quarterly Report on Form 10 -Q have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). These rules and regulations permit some of the information and footnote disclosures normally included in financial statements , prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”), to be condensed or omitted. In management’s opinion, the unaudited consolidated financial statements contain all adjustments that are of a normal recurring nature, necessary for a fair presentation of the results of operations and financial position of the Company for the interim periods presented. The Company reports operating results and financial data in one operating and reportable segment. Operating results for the six -month period ended June 30, 2017 are not necessarily indicative of the results that may be expected for the year ending December 31, 2017. These unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements for the year ended December 31, 2016, and the notes thereto included in the Company’s Annual Report on Form 10 -K, filed with the SEC on February 28, 2017 ( “the Annual Report”). Significant Accounting Policies Goodwill Impairment Test Date The Company has historically performed its annual goodwill impairment test as of September 30 of each year. For the annual impairment test as of September 30, 2016, the Company performed a qualitative assessment of whether it was more likely than not that the Company’s reporting unit's fair value was less than its carrying amount. After completing the assessment, the Company determined that it was more likely than not that the estimated fair value of the reporting unit exceeded the carrying amount and that no impairment existed as of the assessment date. If the Company had concluded otherwise, a quantitative goodwill impairment test would have been required, which would have included a determination of the fair value of the reporting unit and a comparison of the fair value to its carrying value. Effective for the annual goodwill impairment test for 2017 and for future testing , the Company will perform the required annual test as of October 1 of each year rather than on September 30. The Company does not believe that the change in the date of the annual goodwill impairment test is a material change in the method of applying an accounting principle nor does it expect that it will result in any delay, acceleration or impact to the results of the impairment testing. The Company believes this date is preferable because it aligns with the timing of the annual strategic planning process which largely occurs during the fourth quarter. Retrospective application to prior periods is impracticable as the Company is unable to objectively determine, without the use of hindsight, the assumptions that would be used in those earlier periods. Other than the anticipated change in the date of its annual goodwill impairment test, there have been no other changes to any other significant accounting policy as further described in Note 2, Summary of Significant Accounting Policie s , of the Notes to the Consolidated Financial Statements in the Annual Report. Other Comprehensive Income Other comprehensive income represents foreign currency translation adjustments arising from the use of differing exchange rates from period to period. The financial positions and results of operations of the Company ’s foreign subsidiaries are based on the local currency as the functional currency and are translated to U.S. dollars for financial reporting purposes. Assets and liabilities of the subsidiaries are translated at the exchange rate in effect at each period-end. Income statement accounts are translated at the average rate of exchange prevailing during the period. Translation adjustments are included in accumulated other comprehensive income (loss) (“AOCI”) in stockholders’ equity in the Company’s consolidated balance sheets. Recent Accountin g Pronouncements Revenue Recognition In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2014 - 09, Revenue from Contracts with Customers (Topic 606 ). ASU 2014 - 09 provides a single comprehensive revenue recognition framework and supersedes almost all existing revenue recognition guidance including industry-specific revenue recognition guidance. Included in the new principles-based revenue recognition model are changes to the basis for determining the timing for revenue recognition. In addition, the standard expands and improves revenue disclosures. In August 2015, the FASB issued ASU 2015 - 14 to amend ASU 2014 - 09 in order to defer the effective date of the new standard. In accordance with this update, the Company has elected to adopt the requirements of the new standard effective January 1, 2018. The guidance permits the Company to either apply the requirements retrospectively to all prior periods presented (full retrospective), or apply the requirements in the year of adoption through a cumulative adjustment (modified retrospective). Under the full retrospective approach, the 2016 and 2017 financial statements would be adjusted to reflect the effects of adopting the new standard. Under the modified retrospective approach, the new standard would, for the period beginning January 1, 2018, apply to new contracts and those that were not completed as of January 1, 2018. For those contracts not completed as of January 1, 2018, this method will result in a cumulative catch-up adjustment to retained earnings. The Company has evaluated the impact of adopting ASU 2014 - 09 on the timing of revenue and expanded disclosure requirements. The Company completed its impact assessment as of June 2017 and has started the implementation phase. Based on this assessment, the Company concluded that, for the majority of its contracts, there is no change in the timing of revenue recognition. However, the new standard will result in a change in revenue timing for performance incentives under certain contracts. Under current guidance, performance incentives are recognized as revenue when specific quantitative goals are achieved, generally at the end of a measurement period. Under the new standard, these incentives are considered variable consideration and the Company will include the most likely amount of the incentives to be earned in the transaction price and recognize revenue associated with the incentives over the term of the agreement. This change is not expected to result in a material change to the Company’s annual revenue since most incentives have a one year measurement period, but the change may accelerate revenue recognized on a quarterly basis. In addition, the new standard changes the guidance regarding principal versus agent revenue reporting which may result in recognition on a gross basis in regards to certain media purchases for the Company’s advertising contracts. Under the gross basis, the Company would recognize as revenue the media cost plus the fee that the Company expects to earn for arranging the purchase, rather than, as in the current practice, to recognize as revenue only the amount of fee that the Company expects to earn. At this time, the Company is in the process of finalizing its evaluation of the impact that the method of adoption will have on its consolidated financial statements and, as a result, has not finalized its adoption method (full retrospective or modified retrospective). Adoption of the new standard will entail successful completion of the implementation phase which includes modifying existing policies, processes and controls as they relate to revenue recognition as well as to the preparation of the required disclosures. Leases In February 2016, the FASB issued ASU 2016 - 02, Leases (Topic 842 ). This update revises an entity ’s accounting for operating leases and requires lessees to recognize a right-of-use asset and lease liability for all leases with terms of more than 12 months. This update also requires that lessees recognize assets and liabilities on the balance sheet for the rights and obligations created by all such leases and requires disclosures designed to give financial statement users information on the amount and timing of lease expenses arising from such leases. These disclosures include certain qualitative and specific quantitative disclosures. For lessees, the new guidance is not expected to significantly change the recognition, measurement, and presentation of expenses arising from a lease. This update is effective for the first interim and annual periods beginning after December 15, 2018, with early adoption permitted. The Company continues to evaluate the impact of adopting ASU 2016 - 02, the elections to be made at adoption in a modified retrospective approach, and the timing of adoption. Statement of Cash Flows In August 2016, the FASB issued ASU 2016 - 15, Statement of Cash Flows (Topic 230 ): Classification of Certain Cash Receipts and Cash Payments. This update addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice. This update is effective for the Company for its fiscal year 2018, with early adoption permitted. The Company is currently evaluating the impact of adopting ASU 2016 - 15. The Company does not expect the update to have a material impact on the consolidated financial statements. In November 2016, the FASB issued ASU 2016 - 18, Statement of Cash Flows (Topic 230 ): Restricted Cash (a consensus of the FASB Emerging Issues Task Force), which requires entities to show the changes in the total of cash, cash equivalents, restricted cash, and restricted cash equivalents in the statement of cash flows. As a result, entities will no longer present transfers between cash and cash equivalents and restricted cash and cash equivalents in the statement of cash flows. ASU 2016 - 18 becomes effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. The Company will apply any adjustments retrospectively. Early adoption of the standard is permitted, and the Company anticipates it will early adopt the standard. The Company is evaluating the impact of ASU 2016 - 18 on its consolidated financial statements resulting from the future adoption of the standard. Restricted cash is currently included within operating cash flows in the consolidated statement of cash flows for all periods presented. Goodwill In January 2017, the FASB issued ASU 2017 - 04, Intangibles – Goodwill and Other (Topic 350 ), which simplifies the measurement of goodwill by eliminating Step 2 from the current goodwill impairment test in the event that there is evidence of an impairment based on qualitative or quantitative assessments. ASU 2017 - 04 does not change how the goodwill impairment is identified, and the Company will continue to perform a qualitative assessment annually to determine whether the two step impairment test is required. The current accounting standard requires the impairment loss to be recognized under Step 2 of the impairment test. This requires the Company to determine whether the carrying amount of the reporting unit ’s goodwill exceeds its implied fair value. The implied fair value is calculated by assigning the fair value of the reporting unit to all of its assets and liabilities as if it had been acquired in a business combination. The new standard would require the Company to determine the fair value of the reporting unit and subtract the carrying value from the fair value of the reporting unit to determine if there is an impairment. ASU 2017 - 04 is effective for the Company for fiscal years after December 15, 2019, and early adoption is permitted. ASU 2017 - 04 is required to be adopted prospectively, and the adoption is effective for annual goodwill impairment tests performed in the year of adoption. The Company is evaluating the impact of ASU 2017 - 04 on its consolidated financial statements resulting from the adoption of the standard.

Note 2 - Contract Receivables

6 Months Ended

Jun. 30, 2017

Notes to Financial Statements

Loans, Notes, Trade and Other Receivables Disclosure [Text Block]

NOTE

– CONTRACT RECEIVABLE

Contract receivables consisted of the following:

	June 30, 2017			December 31, 2016
Billed	$	165,753		$	170,436
Unbilled		125,629			113,520
Allowance for doubtful accounts		(3,204	)		(2,591	)
Contract receivables, net	$	288,178		$	281,365

Contract receivables, net of the established allowance for doubtful accounts, are stated at amounts expected to be realized in future periods. Unbilled receivables result from revenue earned in advance of billing

and which can be invoiced at contractually defined intervals or milestones, as well as upon completion of the contract or government audits. The Company anticipates that the majority of unbilled receivables will be substantially billed and collected within

one

year, which permits the Company to classify them as current assets in accordance with industry practice.

The Company considers a number of factors in its estimate of allowance for doubtful accounts, including the customer

’s financial condition, historical collection experience, and other factors that

may

bear on collectability of the receivables. The Company writes off contract receivables when such amounts are determined to be uncollectible.

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References + Details

Note 3 - Long-term Debt	6 Months Ended
Note 3 - Long-term Debt	Jun. 30, 2017
Notes to Financial Statements
Long-term Debt [Text Block]	NOTE 3 - LONG-TERM DEBT On May 17, 2017, the Company entered into a Fifth Amended and Restated Business Loan and Security Agreement with a syndication of 11 commercial banks (the “Credit Facility”). The Credit Facility: (i) includes modifications to the Company’s Fourth Amended and Restated Business Loan and Security Agreement, (ii) matures on May 17, 2022, ( iii) increases the borrowing ceiling up to $600.0 million without a borrowing base requirement, taking into account financial, performance-based limitations, and (iv) provides for an “accordion,” which permits additional revolving credit commitments of up to $300.0 million, subject to lenders’ approval. While the modification of the Credit Facility did not increase our debt outstanding, $106.0 million of funds from new syndicated borrowings was used to pay off or pay down borrowings from syndicate members prior to the loan modification and align the allocation of debt within the syndication. These amounts were included within the “Advances from working capital facilities” and “Payments on working capital facilities” line items in the statement of cash flows for the period ended June 30, 2017. The Company has the option to borrow funds under the Credit Facility at interest rates based on both LIBOR ( 1, 3, or 6 month rates) and the Base Rate, at its discretion, plus their applicable margins. Base Rates are fluctuating per annum rates of interest equal to the highest of (i) the Federal Funds Open Rate, plus 0.5%, (ii) the Prime Rate, and (iii) the daily LIBOR rate, plus 1.00%. The interest accrued based on LIBOR rates is to be paid on the last business day of the interest period ( 1, 3, or 6 months), while interest accrued based on the Base Rates is to be paid in quarterly installments. The Credit Facility provides for letters of credit aggregating up to $60.0 million which reduce the funds available under the Credit Facility when issued. The Credit Facility is collateralized by substantially all of the assets of the Company and requires that the Company remain in compliance with certain financial and non-financial covenants. The financial covenants, require, among other things, that the Company maintain at all times an Interest Coverage Ratio (as defined under the Credit Facility) of not less than 3.00 to 1.00 and a Leverage Ratio (as defined, under the Credit Facility) of not more than 3.75 to 1.00 (subject to adjustment, in certain circumstances to 4.00 to 1.00 ) for each fiscal quarter. As of June 30, 2017, the Company was in compliance with its covenants under the Credit Facility. As of June 30, 2017, the Company had $278.0 million in long-term debt outstanding, $3.4 million in outstanding letters of credit, and unused borrowing capacity of $318.6 million under the Credit Facility (excluding the accordion). Taking into account the financial, performance-based limitations, available borrowing capacity (excluding the accordion) was $184.5 million as of June 30, 2017. The weighted-average interest rate on debt outstanding was 2.6% for the first six months of 2017.

Note 4 - Income Taxes	6 Months Ended
Note 4 - Income Taxes	Jun. 30, 2017
Notes to Financial Statements
Income Tax Disclosure [Text Block]	NOTE 4 - INCOME TAXES The Company ’s effective tax rate for each of the three and six month periods ended June 30, 2017 and 2016 was 40.0% and 37.2%, and 36.3% and 36.7%, respectively. The Company is subject to federal income taxes in the U.S. as well as to taxes in various state and foreign jurisdictions. Tax statutes and regulations within each jurisdiction are subject to interpretation and require the application of significant judgment. The Company’s 2013 through 2016 tax years remain subject to examination by the Internal Revenue Service for federal tax purposes. Certain significant state and foreign tax returns also remain open under the applicable statute of limitations and are subject to examination for the tax years from 2013 to 2016. The Company ’s total liability for unrecognized tax benefits as of June 30, 2017 was $1.2 million. Included in the balance as of June 30, 2017 was $1.0 million of tax positions that, if recognized, would have a favorable impact on the Company’s effective tax rate. The Company believes it is reasonably possible that, during the next 12 months, the Company’s liability for uncertain tax benefits may decrease by approximately $0.4 million. The Company ’s policy is not to recognize accrued interest and penalties related to unrecognized tax benefits as a component of tax expense. The Company has made no provision for deferred U.S. income taxes or additional foreign taxes on future unremitted earnings of its controlled foreign subsidiaries because the Company considers these earnings to be permanently invested.

Note 5 - Accounting for Stock Compensation	6 Months Ended
Note 5 - Accounting for Stock Compensation	Jun. 30, 2017
Notes to Financial Statements
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	NOTE 5 - ACCOUNTING FOR STOCK COMPENSATION The ICF International, Inc. 2010 Omnibus Incentive Plan (as amended, the “Omnibus Plan”) provides for the granting of options, stock appreciation rights, restricted stock, restricted stock units (“RSUs”), performance shares, performance units, cash-based awards, and other stock-based awards to all officers, key employees, and non-employee directors of the Company. As of June 30, 2017, the Company had approximately 1.8 million shares available for grant under the Omnibus Plan. Cash-settled RSUs (“CSRSUs”) have no impact on the shares available for grant under the Omnibus Plan, and on the calculated shares used in earnings per share (“EPS”) calculations. During the six months ended June 30, 2017, the Company granted to its employees approximately 0.2 million shares in the form of RSUs with an average grant date fair value of $41.35, and the equivalent value of approximately 0.2 million shares in the form of CSRSUs with an average grant date fair value of $41.66. During the six months ended June 30, 2017, the Company also granted approximately 0.1 million shares in the form of performance-based share awards (“PSAs”) to its employees with a grant date fair value of $38.81 per share. The RSUs, CSRSUs and PSAs granted are generally subject to service-based vesting conditions, with the PSAs also having performance-based vesting conditions. The performance conditions for the PSAs granted in 2017 have a performance period from January 1, 2017 through December 31, 2019 and the performance conditions are consistent with the PSAs granted in the prior years, except for a lower assumed compounded annual growth rate in the earnings per share during the performance period and a higher threshold for the Company to maximize performance shares to be awarded. The Company’s performance-based share program is further described in Note 13, Accounting for Stock-Based Compensation , of the Notes to the Consolidated Financial Statements in the Annual Report. The Company recognized stock-based compensation expense of $4.7 million and $4.9 million for the three months ended June 30, 2017 and 2016, respectively, and $8.2 million and $8.1 million for the six months ended June 30, 2017 and 2016, respectively. Unrecognized compensation expense of approximately $17.0 million as of June 30, 2017 related to unsettled RSUs is expected to be recognized over a weighted-average period of 2.4 years. The unrecognized compensation expense related to CSRSUs totaled approximately $17.5 million at June 30, 2017 and is expected to be recognized over a weighted-average period of 2.3 years. Unrecognized compensation expense related to PSAs of approximately $3.9 million as of June 30, 2017 is expected to be recognized over a weighted-average period of 1.5 years.

Note 6 - Earnings Per Share

6 Months Ended

Jun. 30, 2017

Notes to Financial Statements

Earnings Per Share [Text Block]

NOTE

- EARNINGS PER SHARE

EPS is computed by dividing reported net income by the weighted-average number of shares outstanding. Diluted EPS considers the potential dilution that could occur if common stock equivalents were exercised or converted into stock. The

difference between the basic and diluted weighted-average equivalent shares with respect to the Company’s EPS calculation is due entirely to the assumed exercise of stock options and the vesting and settlement of RSUs and PSAs.

PSAs are included in the computation of diluted shares only to the extent that the underlying performance conditions (i) are satisfied as of the end of the reporting period or (ii) would be considered satisfied if the end of the reporting period were also the end of the applicable performance period and the result would be dilutive under the treasury stock method.

As of

June 30, 2017,

the PSAs granted during the year ended

December 31, 2015

met the related performance conditions and were included in the calculation of diluted EPS. However, the PSAs granted during the year ended

December 31, 2016

and during the

six

-month period ended

June 30, 2017

have

not

yet completed their initial

two

-year performance period and therefore were excluded in the calculation of diluted EPS. There were

and

0.2

million weighted-average shares primarily associated with stock options, excluded from the calculation of EPS because they were anti-dilutive for the

six

-month periods ended

June 30, 2017

and

2016,

respectively.

The dilutive effect of stock options

, RSUs, and PSAs for each period reported is summarized below:

	Three Months Ended June 30,				Six Months Ended June 30,
	2017		201 6		201 7		201 6
Net Income	$	11,937	$	10,583	$	22,114	$	20,474

Weighted-average number of basic shares outstanding during the period		18,775		19,008		18,840		19,001
Dilutive effect of stock options , RSUs, and PSAs		311		285		412		319
Weighted-average number of diluted shares outstanding during the period		19,086		19,293		19,252		19,320

Basic earnings per share	$	0.64	$	0.56	$	1.17	$	1.08
Diluted earnings per share	$	0.63	$	0.55	$	1.15	$	1.06

Note 7 - Share Repurchase Program	6 Months Ended
Note 7 - Share Repurchase Program	Jun. 30, 2017
Notes to Financial Statements
Treasury Stock [Text Block]	NOTE 7 – SHARE REPURCHASE PROGRAM As part of the Company ’s modification of the Credit Facility, the Credit Facility limits on share repurchases were eliminated to permit unlimited share repurchases, provided the Company’s Leverage Ratio, prior to and after giving effect to such repurchases, is not greater than 3.25 to 1.00.

Note 8 - Commitments and Contingencies	6 Months Ended
Note 8 - Commitments and Contingencies	Jun. 30, 2017
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	N OTE 8 - COMMITMENT S AND CONTINGENCIES Litigation and Claims The Company is involved in various legal matters and proceedings arising in the ordinary course of business. While these matters and proceedings cause it to incur costs, including, but not limited to, attorneys ’ fees, the Company currently believes that any ultimate liability arising out of these matters and proceedings will not have a material adverse effect on its financial position, results of operations, or cash flows. Road Home Contract On June 10, 2016, the Office of Community Development (the “OCD”) of the State of Louisiana filed a written administrative demand with the Louisiana Commissioner of Administration against ICF Emergency Management Services, L.L.C. (“ICF Emergency”), a subsidiary of the Company, in connection with ICF Emergency ’s administration of the Road Home Program (“Program”). The Program contract was a three -year, $912 million contract awarded to the Company in 2006. The Program ended, as scheduled, in 2009. The Program was primarily intended to help homeowners and landlords of small rental properties affected by Hurricanes Rita and Katrina. In its administrative demand, the OCD sought approximately $200.8 million in alleged overpayments to the Program’s grant recipients. The State of Louisiana separately supplemented the amount of recovery it is seeking in total to approximately $219.4 million. The State of Louisiana, through the Division of Administration, also filed suit in Louisiana state court on June 10, 2016. The State of Louisiana broadly alleges and seeks recoupment for the same claim made in the administrative proceeding submission before the Louisiana Commissioner of Administration. On September 21, 2016, the Commissioner of the Division of Administration notified OCD and the Company of his decision to defer jurisdiction of the administrative demand filed by the OCD. In so doing, the Commissioner declined to reach a decision on the merits and stated that his deferral would not be deemed to grant or deny any portion of the OCD’s claim. The Commissioner subsequently authorized the parties to proceed on the matter in the previously filed judicial proceeding. The Company continues to believe that this claim has no merit and intends to vigorously defend its position. The Company has therefore not recorded a liability.

Significant Accounting Policies (Policies)	6 Months Ended
Significant Accounting Policies (Policies)	Jun. 30, 2017
Accounting Policies [Abstract]
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]	Goodwill Impairment Test Date The Company has historically performed its annual goodwill impairment test as of September 30 of each year. For the annual impairment test as of September 30, 2016, the Company performed a qualitative assessment of whether it was more likely than not that the Company’s reporting unit's fair value was less than its carrying amount. After completing the assessment, the Company determined that it was more likely than not that the estimated fair value of the reporting unit exceeded the carrying amount and that no impairment existed as of the assessment date. If the Company had concluded otherwise, a quantitative goodwill impairment test would have been required, which would have included a determination of the fair value of the reporting unit and a comparison of the fair value to its carrying value. Effective for the annual goodwill impairment test for 2017 and for future testing , the Company will perform the required annual test as of October 1 of each year rather than on September 30. The Company does not believe that the change in the date of the annual goodwill impairment test is a material change in the method of applying an accounting principle nor does it expect that it will result in any delay, acceleration or impact to the results of the impairment testing. The Company believes this date is preferable because it aligns with the timing of the annual strategic planning process which largely occurs during the fourth quarter. Retrospective application to prior periods is impracticable as the Company is unable to objectively determine, without the use of hindsight, the assumptions that would be used in those earlier periods. Other than the anticipated change in the date of its annual goodwill impairment test, there have been no other changes to any other significant accounting policy as further described in Note 2, Summary of Significant Accounting Policie s , of the Notes to the Consolidated Financial Statements in the Annual Report.
Comprehensive Income, Policy [Policy Text Block]	Other Comprehensive Income Other comprehensive income represents foreign currency translation adjustments arising from the use of differing exchange rates from period to period. The financial positions and results of operations of the Company ’s foreign subsidiaries are based on the local currency as the functional currency and are translated to U.S. dollars for financial reporting purposes. Assets and liabilities of the subsidiaries are translated at the exchange rate in effect at each period-end. Income statement accounts are translated at the average rate of exchange prevailing during the period. Translation adjustments are included in accumulated other comprehensive income (loss) (“AOCI”) in stockholders’ equity in the Company’s consolidated balance sheets.
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accountin g Pronouncements Revenue Recognition In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2014 - 09, Revenue from Contracts with Customers (Topic 606 ). ASU 2014 - 09 provides a single comprehensive revenue recognition framework and supersedes almost all existing revenue recognition guidance including industry-specific revenue recognition guidance. Included in the new principles-based revenue recognition model are changes to the basis for determining the timing for revenue recognition. In addition, the standard expands and improves revenue disclosures. In August 2015, the FASB issued ASU 2015 - 14 to amend ASU 2014 - 09 in order to defer the effective date of the new standard. In accordance with this update, the Company has elected to adopt the requirements of the new standard effective January 1, 2018. The guidance permits the Company to either apply the requirements retrospectively to all prior periods presented (full retrospective), or apply the requirements in the year of adoption through a cumulative adjustment (modified retrospective). Under the full retrospective approach, the 2016 and 2017 financial statements would be adjusted to reflect the effects of adopting the new standard. Under the modified retrospective approach, the new standard would, for the period beginning January 1, 2018, apply to new contracts and those that were not completed as of January 1, 2018. For those contracts not completed as of January 1, 2018, this method will result in a cumulative catch-up adjustment to retained earnings. The Company has evaluated the impact of adopting ASU 2014 - 09 on the timing of revenue and expanded disclosure requirements. The Company completed its impact assessment as of June 2017 and has started the implementation phase. Based on this assessment, the Company concluded that, for the majority of its contracts, there is no change in the timing of revenue recognition. However, the new standard will result in a change in revenue timing for performance incentives under certain contracts. Under current guidance, performance incentives are recognized as revenue when specific quantitative goals are achieved, generally at the end of a measurement period. Under the new standard, these incentives are considered variable consideration and the Company will include the most likely amount of the incentives to be earned in the transaction price and recognize revenue associated with the incentives over the term of the agreement. This change is not expected to result in a material change to the Company’s annual revenue since most incentives have a one year measurement period, but the change may accelerate revenue recognized on a quarterly basis. In addition, the new standard changes the guidance regarding principal versus agent revenue reporting which may result in recognition on a gross basis in regards to certain media purchases for the Company’s advertising contracts. Under the gross basis, the Company would recognize as revenue the media cost plus the fee that the Company expects to earn for arranging the purchase, rather than, as in the current practice, to recognize as revenue only the amount of fee that the Company expects to earn. At this time, the Company is in the process of finalizing its evaluation of the impact that the method of adoption will have on its consolidated financial statements and, as a result, has not finalized its adoption method (full retrospective or modified retrospective). Adoption of the new standard will entail successful completion of the implementation phase which includes modifying existing policies, processes and controls as they relate to revenue recognition as well as to the preparation of the required disclosures. Leases In February 2016, the FASB issued ASU 2016 - 02, Leases (Topic 842 ). This update revises an entity ’s accounting for operating leases and requires lessees to recognize a right-of-use asset and lease liability for all leases with terms of more than 12 months. This update also requires that lessees recognize assets and liabilities on the balance sheet for the rights and obligations created by all such leases and requires disclosures designed to give financial statement users information on the amount and timing of lease expenses arising from such leases. These disclosures include certain qualitative and specific quantitative disclosures. For lessees, the new guidance is not expected to significantly change the recognition, measurement, and presentation of expenses arising from a lease. This update is effective for the first interim and annual periods beginning after December 15, 2018, with early adoption permitted. The Company continues to evaluate the impact of adopting ASU 2016 - 02, the elections to be made at adoption in a modified retrospective approach, and the timing of adoption. Statement of Cash Flows In August 2016, the FASB issued ASU 2016 - 15, Statement of Cash Flows (Topic 230 ): Classification of Certain Cash Receipts and Cash Payments. This update addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice. This update is effective for the Company for its fiscal year 2018, with early adoption permitted. The Company is currently evaluating the impact of adopting ASU 2016 - 15. The Company does not expect the update to have a material impact on the consolidated financial statements. In November 2016, the FASB issued ASU 2016 - 18, Statement of Cash Flows (Topic 230 ): Restricted Cash (a consensus of the FASB Emerging Issues Task Force), which requires entities to show the changes in the total of cash, cash equivalents, restricted cash, and restricted cash equivalents in the statement of cash flows. As a result, entities will no longer present transfers between cash and cash equivalents and restricted cash and cash equivalents in the statement of cash flows. ASU 2016 - 18 becomes effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. The Company will apply any adjustments retrospectively. Early adoption of the standard is permitted, and the Company anticipates it will early adopt the standard. The Company is evaluating the impact of ASU 2016 - 18 on its consolidated financial statements resulting from the future adoption of the standard. Restricted cash is currently included within operating cash flows in the consolidated statement of cash flows for all periods presented. Goodwill In January 2017, the FASB issued ASU 2017 - 04, Intangibles – Goodwill and Other (Topic 350 ), which simplifies the measurement of goodwill by eliminating Step 2 from the current goodwill impairment test in the event that there is evidence of an impairment based on qualitative or quantitative assessments. ASU 2017 - 04 does not change how the goodwill impairment is identified, and the Company will continue to perform a qualitative assessment annually to determine whether the two step impairment test is required. The current accounting standard requires the impairment loss to be recognized under Step 2 of the impairment test. This requires the Company to determine whether the carrying amount of the reporting unit ’s goodwill exceeds its implied fair value. The implied fair value is calculated by assigning the fair value of the reporting unit to all of its assets and liabilities as if it had been acquired in a business combination. The new standard would require the Company to determine the fair value of the reporting unit and subtract the carrying value from the fair value of the reporting unit to determine if there is an impairment. ASU 2017 - 04 is effective for the Company for fiscal years after December 15, 2019, and early adoption is permitted. ASU 2017 - 04 is required to be adopted prospectively, and the adoption is effective for annual goodwill impairment tests performed in the year of adoption. The Company is evaluating the impact of ASU 2017 - 04 on its consolidated financial statements resulting from the adoption of the standard.

Note 2 - Contract Receivables (Tables)

6 Months Ended

Jun. 30, 2017

Notes Tables

Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

	June 30, 2017			December 31, 2016
Billed	$	165,753		$	170,436
Unbilled		125,629			113,520
Allowance for doubtful accounts		(3,204	)		(2,591	)
Contract receivables, net	$	288,178		$	281,365

Note 6 - Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2017

Notes Tables

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
	2017		201 6		201 7		201 6
Net Income	$	11,937	$	10,583	$	22,114	$	20,474

Weighted-average number of basic shares outstanding during the period		18,775		19,008		18,840		19,001
Dilutive effect of stock options , RSUs, and PSAs		311		285		412		319
Weighted-average number of diluted shares outstanding during the period		19,086		19,293		19,252		19,320

Basic earnings per share	$	0.64	$	0.56	$	1.17	$	1.08
Diluted earnings per share	$	0.63	$	0.55	$	1.15	$	1.06

Note 1 - Nature of Operations and Basis of Presentation (Details Textual) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Sep. 30, 2016 USD ($)
Number of Operating Segments	1
Goodwill, Impaired, Accumulated Impairment Loss		$ 0
Number of Reportable Segments	1
Domestic [Member]
Number of Offices	55
International [Member]
Number of Offices	10

Note 2 - Contract Receivables (Details Textual)	6 Months Ended
Note 2 - Contract Receivables (Details Textual)	Jun. 30, 2017
Majority of Unbilled Receivables Will Be Substantially Billed and Collected	1 year

Note 2 - Contract Receivables - Summary of Contract Receivables (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Billed	$ 165,753	$ 170,436
Unbilled	125,629	113,520
Allowance for doubtful accounts	(3,204)	(2,591)
Contract receivables, net	$ 288,178	$ 281,365

Note 3 - Long-term Debt (Details Textual) $ in Thousands	May 17, 2017 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Credit Facility Syndication, Number of Commercial Banks	11
Line of Credit Facility, Maximum Borrowing Capacity Without Borrowing Base Requirement	$ 600,000
Line of Credit Facility, Accordion Feature, Additional Revolving Credit Commitments Under Existing Loan Facility	300,000
New Syndicated Borrowings Used to Pay Off or Pay Down Borrowings from Syndicate Members	$ 106,000
Line of Credit Facility, Interest Coverage Ratio Covenant	3
Line of Credit Facility, Leverage Ratio Covenant	3.75
Line of Credit Facility, Adjusted Leverage Ratio Covenant Under Certain Circumstances	4
Long-term Debt, Excluding Current Maturities		$ 278,000	$ 259,389
Letters of Credit Outstanding, Amount		3,400
Line of Credit Facility, Remaining Borrowing Capacity		318,600
Line of Credit Facility, Current Borrowing Capacity		$ 184,500
Weighted Average [Member]
Long-term Debt, Weighted Average Interest Rate, at Point in Time		2.60%
Line of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 60,000
Federal Funds Effective Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	0.50%
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	1.00%

Note 4 - Income Taxes (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Effective Income Tax Rate Reconciliation, Percent	40.00%	37.20%	36.30%	36.70%
Unrecognized Tax Benefits	$ 1.2		$ 1.2
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	1.0		1.0
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$ 0.4		$ 0.4
Internal Revenue Service (IRS) [Member] \| Earliest Tax Year [Member]
Open Tax Year			2013
Internal Revenue Service (IRS) [Member] \| Latest Tax Year [Member]
Open Tax Year			2016
State and Foreign Jurisdictions [Member] \| Earliest Tax Year [Member]
Open Tax Year			2013
State and Foreign Jurisdictions [Member] \| Latest Tax Year [Member]
Open Tax Year			2016

Note 5 - Accounting for Stock Compensation (Details Textual) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Allocated Share-based Compensation Expense	$ 4.7	$ 4.9	$ 8.2	$ 8.1
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 41.35
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			0.2
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	17.0		$ 17.0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			2 years 146 days
Cash Settled RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 41.66
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			0.2
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	17.5		$ 17.5
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			2 years 109 days
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 38.81
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			0.1
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 3.9		$ 3.9
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			1 year 182 days
Omnibus Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1.8		1.8

Note 6 - Earnings Per Share (Details Textual) - shares shares in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	200
Performance Shares [Member] \| Initial Performance Vesting Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	2 years

Note 6 - Earnings Per Share - Dilutive Effect of Stock Options and Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net income	$ 11,937	$ 10,583	$ 22,114	$ 20,474
Basic (in shares)	18,775	19,008	18,840	19,001
Dilutive effect of stock options, RSUs, and PSAs (in shares)	311	285	412	319
Weighted-average number of diluted shares outstanding during the period (in shares)	19,086	19,293	19,252	19,320
Basic (in dollars per share)	$ 0.64	$ 0.56	$ 1.17	$ 1.08
Diluted (in dollars per share)	$ 0.63	$ 0.55	$ 1.15	$ 1.06

Note 7 - Share Repurchase Program (Details Textual)	Jun. 30, 2017
Line of Credit Facility, Conditions for the Elimination of Limits on Shares Repurchases, Leverage Ratio	3.25

Note 8 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions	Jun. 10, 2016	Jun. 30, 2017
Community Development Related to Claim		$ 219.4
OCD vs ICF Emergency [Member]
Loss Contingency, Damages Sought, Value	$ 200.8
Road Home Contract [Member]
Contract Term, Period	3 years
Contract Award, Value	$ 912.0