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Document And Entity Information - shares	3 Months Ended
Document And Entity Information - shares	Mar. 31, 2017	Apr. 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)		18,799,705
Document Type	10-Q/A
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q1
Amendment Flag	true
Amendment Description	The sole purpose of this Amendment No. 1 on Form 10-Q/A to ICF International, Inc.'s Quarterly Report on Form 10-Q for the quarter ended March 31, 2017, filed with the Securities and Exchange Commission on May 4, 2017 (the "Form 10-Q"), is to change the date reference from May 5, 2017 to May 4, 2017 on the Signatures page and on the certifications filed as Exhibits 31.1, 31.2, 32.1 and 32.2. No other changes have been made to the Form 10-Q. This Form 10-Q/A does not reflect events that may have occurred subsequent to the original filing date, and does not modify or update in any way disclosures made in the original Form 10-Q.

Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current Assets
Cash and cash equivalents	$ 8,207	$ 6,042
Contract receivables, net	278,795	281,365
Prepaid expenses and other	13,294	11,724
Income tax receivable	1,362
Total current assets	301,658	299,131
Total property and equipment, net	38,719	40,484
Other assets:
Goodwill	683,998	683,683
Other intangible assets, net	43,408	46,129
Restricted cash	1,247	1,843
Other assets	14,883	14,301
Total Assets	1,083,913	1,085,571
Current Liabilities
Accounts payable	54,129	70,586
Accrued salaries and benefits	50,087	44,003
Accrued expenses and other current liabilities	45,925	52,631
Deferred revenue	27,280	29,394
Income tax payable		106
Total Current Liabilities	177,421	196,720
Long-term Liabilities:
Long-term debt	275,843	259,389
Deferred rent	15,035	15,600
Deferred income taxes	43,843	39,114
Other	9,518	8,744
Total Liabilities	521,660	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; 21,906,617 and 21,663,432 shares issued; and 18,837,025 and 19,021,262 shares outstanding as of March 31, 2017, and December 31, 2016, respectively	22	22
Additional paid-in capital	297,077	292,427
Retained earnings	382,067	371,890
Treasury stock	(107,645)	(88,695)
Accumulated other comprehensive loss	(9,268)	(9,640)
Total Stockholders’ Equity	562,253	566,004
Total Liabilities and Stockholders’ Equity	$ 1,083,913	$ 1,085,571

Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Mar. 31, 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)	21,906,617	21,663,432
Common stock, outstanding (in shares)	18,837,025	19,021,262

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenue	$ 296,295	$ 283,599
Direct Costs	183,607	177,199
Operating costs and expenses:
Indirect and selling expenses	88,802	81,559
Depreciation and amortization	4,519	4,019
Amortization of intangible assets	2,734	3,128
Total operating costs and expenses	96,055	88,706
Operating income	16,633	17,694
Interest expense	(1,951)	(2,445)
Other income	109	275
Income before income taxes	14,791	15,524
Provision for income taxes	4,614	5,633
Net income	$ 10,177	$ 9,891
Earnings per Share:
Basic (in dollars per share)	$ 0.54	$ 0.52
Diluted (in dollars per share)	$ 0.52	$ 0.51
Weighted-average Shares:
Basic (in shares)	18,972	18,994
Diluted (in shares)	19,423	19,273
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax	$ 372	$ (917)
Comprehensive income, net of tax	$ 10,549	$ 8,974

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash Flows from Operating Activities
Net income	$ 10,177	$ 9,891
Adjustments to reconcile net income to net cash provided by operating activities:
Non-cash equity compensation	2,618	2,641
Depreciation and amortization	7,253	7,147
Other adjustments, net	5,944	1,152
Changes in operating assets and liabilities, net of the effect of acquisitions:
Contract receivables, net	3,094	(19,460)
Prepaid expenses and other assets	(2,170)	(5,812)
Accounts payable	(16,583)	(12,441)
Accrued salaries and benefits	6,058	5,154
Accrued expenses and other current liabilities	(7,304)	(3,848)
Deferred revenue	(2,206)	(812)
Income tax receivable and payable	(1,475)	3,645
Restricted cash	603	(12)
Other liabilities	696	(622)
Net Cash Provided by (Used in) Operating Activities	6,705	(13,377)
Cash Flows from Investing Activities
Capital expenditures for property and equipment and capitalized software	(2,571)	(4,184)
Payments for business acquisitions, net of cash received	(91)
Net Cash Used in Investing Activities	(2,662)	(4,184)
Cash Flows from Financing Activities
Advances from working capital facilities	127,179	123,279
Payments on working capital facilities	(110,725)	(96,881)
Payments on capital expenditure obligations	(1,454)	(1,010)
Proceeds from exercise of options	2,095
Net payments for stockholder issuances and buybacks	(19,014)	(6,664)
Net Cash (Used in) Provided by Financing Activities	(1,919)	18,724
Effect of exchange rate changes on cash	41	449
Increase in Cash and Cash Equivalents	2,165	1,612
Cash and Cash Equivalents, Beginning of Period	6,042	7,747
Cash and Cash Equivalents, End of Period	8,207	9,359
Supplemental Disclosure of Cash Flow Information
Interest	1,988	1,485
Income taxes	$ 1,296	$ 587

Note 1 - Basis of Presentation

3 Months Ended

Mar. 31, 2017

Notes to Financial Statements

Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]

NOTE

- BASIS OF PRESENTATION

Nature of Operations

ICF International, Inc. and its subsidiaries (collectively, the “

Company”) provide professional services and technology-based solutions, including management, technology, and policy consulting and implementation services, to government and commercial clients that operate in

four

key markets which are: 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, and the provision 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 (“HHS”), the Department of State (“DOS”), and the Department of Defense (“DoD”). The Company also serves state and local government departments and agencies; international governments; and commercial clients worldwide, such as airlines, airports, electric and gas utilities, 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

offices in the U.S. and more than

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

-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

three

-month period ended

March

31,

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

-K, filed with the SEC on

February

28,

2017

(“Annual Report”).

Significant Accounting Policies

Goodwill Impairment Test Date

The Company has historically performed its annual goodwill impairment test as of

September

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 include a determination and comparison of the fair value of the reporting unit to its carrying value

Effective for the annual goodwill impairment test for

2017

and prospectively

, the Company will perform the required annual test as of

October

of each year rather than on

September

as was the previous practice. The Company does not believe that the change in the date of our 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 avoidance of impairment. The Company believes this date of the annual goodwill impairment test is preferable because it aligns with the timing of the annual strategic planning process which largely occurs during the

fourth

quarter. The change will be applied prospectively beginning on

October

2017;

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 our annual goodwill impairment test, there have been no other changes to any other significant accounting policy as further described in Note

Summary of Significant Accounting Policies

, of the Notes to the Consolidated Financial Statements in the Company's Annual Report

Reclassifications

During the

second

quarter of

2016,

the Company elected to early adopt Accounting Standard Update (“ASU”)

2016

09,

Improvements to Employee Share-Based Payment Accounting (Topic

718).

The adoption of ASU

2016

resulted in the recognition of excess tax benefits in the Company’s provision for income taxes rather than additional paid-in-capital of

$0.2

million for the

three

months ended

March

31,

2016.

In addition, the Company’s net cash provided by operating activities increased

$0.2

million with a corresponding decrease to net cash provided by financing activities for the

three

months ended

March

31,

2016.

The impact of the adoption on the Company

’s previously reported results for the

first

quarter of

2016

is summarized as follows:

	Three Months Ended March 31, 2016
	As reported			As adjusted
Consolidated Statement of Comprehensive Income (unaudited)
Provision for income taxes	$	5,837		$	5,633
Net income	$	9,687		$	9,891
Comprehensive income, net of tax	$	8,770		$	8,974
Basic earnings per share	$	0.51		$	0.52
Diluted earnings per share	$	0.50		$	0.51
Diluted weighted average shares outstanding		19,293			19,273

Consolidated Statement of Cash Flows (unaudited)
Net cash used in operating activities	$	(13,581	)	$	(13,377	)
Net cash provided by financing activities	$	18,928		$	18,724

Recent

Accountin

g Pronouncements

Revenue Recognition

May

2014,

the

Financial Accounting Standards Board (“FASB”) issued ASU

2014

09,

Revenue from Contracts with Customers (Topic

606).

ASU

2014

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

to amend ASU

2014

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

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

2018,

apply to new contracts and those that were not completed as of

January

2018.

For those contracts not completed as of

January

2018,

this would result in a cumulative catch-up adjustment to retained earnings.

The Company continues to evaluate the impact of adopting ASU

2014

on the nature and timing of revenues and expanded disclosure requirements.

The Company has completed a preliminary assessment as of

December

2016

and expects to complete the final assessment in

June

2017.

Based upon this assessment, the Company anticipates that the new standard

may

result in a change in the timing of its revenue recognition for performance incentives received from clients. Performance incentives are currently recognized as revenue when specific quantitative goals are achieved. Under the new standard, the Company will estimate the amount of the incentive that will be earned and recognize the incentive over the term of the agreement. This change will likely not result in a material change to the Company's annual revenue but

may

accelerate revenue recognized on a quarterly basis. At this time, the Company has not selected an adoption method (full retrospective or modified retrospective) and continues to evaluate the impact the new guidance and the method of adoption will have on its consolidated financial statements. Adoption of the new standard will not only involve the completion of the final assessment, but also successful implementation efforts which will include modifying existing policies, processes and controls as they relate to revenue recognition.

Leases

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

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

August

2016,

the FASB issued ASU

2016

, 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.

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 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 restricted cash equivalents in the statement of cash flows. ASU

2016

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. The Company is evaluating the impact of ASU

2016

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

January

2017,

the FASB issued ASU

2017

04,

Intangibles – Goodwill and Other (Topic

350),

which simplifies the measurement of goodwill by eliminating Step

from the current goodwill impairment test in the event that there is evidence of an impairment based on qualitative or quantitative assessments. ASU

2017

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. Until the adoption, current accounting standards require the impairment loss to be recognized under Step

of the impairment test. This requires the Company to calculate the implied fair value of goodwill by assigning fair value to the reporting unit’s assets and liabilities as if the reporting unit has been acquired in a business combination, then subsequently subtracting the implied goodwill from the carrying amount of the goodwill. 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

is effective for the Company for fiscal years after

December

15,

2019,

and early adoption is permitted. ASU

2017

is required to be adopted prospectively, and the adoption is effective for annual goodwill impairment tests performed in the year of adoption.

Note 2 - Contract Receivables

3 Months Ended

Mar. 31, 2017

Notes to Financial Statements

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

NOTE

– CONTRACT RECEIVABLE

Contract receivables consisted of the following:

	March 31, 2017			December 31, 2016
Billed	$	167,561		$	170,436
Unbilled		114,385			113,520
Allowance for doubtful accounts		(3,151	)		(2,591	)
Contract receivables, net	$	278,795		$	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 - Property and Equipment

3 Months Ended

Mar. 31, 2017

Notes to Financial Statements

Property, Plant and Equipment Disclosure [Text Block]

NOTE

PROPERTY AND EQUIPMENT

Property and equip

ment consisted of the following:

	March 31, 2017			December 31, 2016
Leasehold improvements	$	17,997		$	17,847
Software		41,784			41,269
Furniture and equipment		27,385			26,570
Computers		29,805			28,874
		116,971			114,560
Accumulated depreciation and amortization		(78,252	)		(74,076	)
Total property and equipment, net	$	38,719		$	40,484

Note 4 - Long-term Debt	3 Months Ended
Note 4 - Long-term Debt	Mar. 31, 2017
Notes to Financial Statements
Long-term Debt [Text Block]	NOTE 4 - LONG-TERM DEBT The Company entered into a Fourth Amended and Restated Business Loan and Security Agreement with a syndication of 11 commercial banks on May 16, 2014 (the “Credit Facility”). The Company further modified the Credit Facility on November 5, 2014. The Credit Facility matures on May 16, 2019 and allows for borrowings of up to $500.0 million without a borrowing base requirement, taking into account financial, performance-based limitations, and provides for an “accordion,” which permits additional revolving credit commitments of up to $100.0 million, subject to lenders’ approval. 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 prime rates, at its discretion, plus their applicable margins. The interest is payable monthly. The Credit Facility provides for stand-by letters of credit aggregating up to $30.0 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, as defined in the Credit Facility, require, among other things, that the Company maintain, a fixed charge coverage ratio of not less than 1.25 to 1.00 and a leverage ratio of not more than 3.75 to 1.00 on a consolidated basis for each quarter. As of March 31, 2017, the Company was in compliance with its covenants under the Credit Facility. As of March 31, 2017, the Company had $275.8 million in long-term debt outstanding, $3.6 million in outstanding letters of credit, and unused borrowing capacity of $220.6 million under the Credit Facility (excluding the accordion). Taking into account the financial, performance-based limitations, available borrowing capacity (excluding the accordion) was $173.8 million as of March 31, 2017. The weighted-average interest rates on debt outstanding was 2.6% for the first three months of 2017.

Note 5 - Income Taxes	3 Months Ended
Note 5 - Income Taxes	Mar. 31, 2017
Notes to Financial Statements
Income Tax Disclosure [Text Block]	NOTE 5 - INCOME TAXES The Company ’s effective tax rate for each of the three -month periods ended March 31, 2017 and 2016 was 31.2% and 36.3%, 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 jurisdictions 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 March 31, 2017 was $1.2 million. Included in the balance as of March 31, 2016 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 6 - Accounting for Stock-based Compensation	3 Months Ended
Note 6 - Accounting for Stock-based Compensation	Mar. 31, 2017
Notes to Financial Statements
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	NOTE 6 - 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 March 31, 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 three months ended March 31, 2017, the Company granted to its employees approximately 0.2 million shares in the form of RSUs and the equivalent value of approximately 0.2 million shares in the form of CSRSUs, each with a grant date fair value of $41.30 . The Company 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 earnings per share during the performance period. 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 Company’s Annual Report. The Company recognized stock-based compensation expense of $3.5 million and $3.2 million for the three months ended March 31, 2017 and 2016, respectively. Unrecognized compensation expense of approximately $19.1 million as of March 31, 2017 related to unsettled RSUs is expected to be recognized over a weighted-average period of 2.6 years. The unrecognized compensation expense related to CSRSUs totaled approximately $18.4 million at March 31, 2017 and is expected to be recognized over a weighted-average period of 2.6 years. Unrecognized compensation expense related to PSAs of approximately $4.5 million as of March 31, 2017 is expected to be recognized over a weighted-average period of 1.8 years.

Note 7 - Earnings Per Share

3 Months Ended

Mar. 31, 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.

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 the end of the related performance period and the result would be dilutive under the treasury stock method.

As of

March

31,

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

three

-month period ended

March

31,

2017

did not meet the related performance conditions and therefore were excluded. There were none 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

three

-month periods ended

March

31,

2017

and

2016,

respectively.

The dilutive effect of stock options

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

	Three Months Ended March 31 ,
	2017		201 6
Net Income	$	10,177	$	9,891

Weighted-average number of basic shares outstanding during the period		18,972		18,994
Dilutive effect of stock options, RSUs, and PSAs		451		279
Weighted-average number of diluted shares outstanding during the period		19,423		19,273

Basic earnings per share	$	0.54	$	0.52
Diluted earnings per share	$	0.52	$	0.51

Note 8 - Commitments and Contingencies	3 Months Ended
Note 8 - Commitments and Contingencies	Mar. 31, 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 by approximately $217.9 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)

3 Months Ended

Mar. 31, 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

of each year. For the annual impairment test as of

September

30,

2016,

the Company performed a qualitative assessment of

Effective for the annual goodwill impairment test for

2017

and prospectively

, the Company will perform the required annual test as of

October

of each year rather than on

September

fourth

quarter. The change will be applied prospectively beginning on

October

2017;

Summary of Significant Accounting Policies

, of the Notes to the Consolidated Financial Statements in the Company's Annual Report

Reclassification, Policy [Policy Text Block]

Reclassifications

During the

second

quarter of

2016,

the Company elected to early adopt Accounting Standard Update (“ASU”)

2016

09,

Improvements to Employee Share-Based Payment Accounting (Topic

718).

The adoption of ASU

2016

resulted in the recognition of excess tax benefits in the Company’s provision for income taxes rather than additional paid-in-capital of

$0.2

million for the

three

months ended

March

31,

2016.

In addition, the Company’s net cash provided by operating activities increased

$0.2

million with a corresponding decrease to net cash provided by financing activities for the

three

months ended

March

31,

2016.

The impact of the adoption on the Company

’s previously reported results for the

first

quarter of

2016

is summarized as follows:

	Three Months Ended March 31, 2016
	As reported			As adjusted
Consolidated Statement of Comprehensive Income (unaudited)
Provision for income taxes	$	5,837		$	5,633
Net income	$	9,687		$	9,891
Comprehensive income, net of tax	$	8,770		$	8,974
Basic earnings per share	$	0.51		$	0.52
Diluted earnings per share	$	0.50		$	0.51
Diluted weighted average shares outstanding		19,293			19,273

Consolidated Statement of Cash Flows (unaudited)
Net cash used in operating activities	$	(13,581	)	$	(13,377	)
Net cash provided by financing activities	$	18,928		$	18,724

New Accounting Pronouncements, Policy [Policy Text Block]

Recent

Accountin

g Pronouncements

Revenue Recognition

May

2014,

the

Financial Accounting Standards Board (“FASB”) issued ASU

2014

09,

Revenue from Contracts with Customers (Topic

606).

ASU

2014

August

2015,

the FASB issued ASU

2015

to amend ASU

2014

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

2018.

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

2018,

apply to new contracts and those that were not completed as of

January

2018.

For those contracts not completed as of

January

2018,

this would result in a cumulative catch-up adjustment to retained earnings.

The Company continues to evaluate the impact of adopting ASU

2014

on the nature and timing of revenues and expanded disclosure requirements.

The Company has completed a preliminary assessment as of

December

2016

and expects to complete the final assessment in

June

2017.

Based upon this assessment, the Company anticipates that the new standard

may

Leases

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

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

August

2016,

the FASB issued ASU

2016

, 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.

November

2016,

the FASB issued ASU

2016

18,

Statement of Cash Flows (Topic

230):

2016

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. The Company is evaluating the impact of ASU

2016

Goodwill

January

2017,

the FASB issued ASU

2017

04,

Intangibles – Goodwill and Other (Topic

350),

which simplifies the measurement of goodwill by eliminating Step

from the current goodwill impairment test in the event that there is evidence of an impairment based on qualitative or quantitative assessments. ASU

2017

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. Until the adoption, current accounting standards require the impairment loss to be recognized under Step

2017

is effective for the Company for fiscal years after

December

15,

2019,

and early adoption is permitted. ASU

2017

is required to be adopted prospectively, and the adoption is effective for annual goodwill impairment tests performed in the year of adoption.

Note 1 - Basis of Presentation (Tables)

3 Months Ended

Mar. 31, 2017

Notes Tables

Impact of New Accounting Pronouncement [Table Text Block]

	Three Months Ended March 31, 2016
	As reported			As adjusted
Consolidated Statement of Comprehensive Income (unaudited)
Provision for income taxes	$	5,837		$	5,633
Net income	$	9,687		$	9,891
Comprehensive income, net of tax	$	8,770		$	8,974
Basic earnings per share	$	0.51		$	0.52
Diluted earnings per share	$	0.50		$	0.51
Diluted weighted average shares outstanding		19,293			19,273

Consolidated Statement of Cash Flows (unaudited)
Net cash used in operating activities	$	(13,581	)	$	(13,377	)
Net cash provided by financing activities	$	18,928		$	18,724

Note 2 - Contract Receivables (Tables)

3 Months Ended

Mar. 31, 2017

Notes Tables

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

	March 31, 2017			December 31, 2016
Billed	$	167,561		$	170,436
Unbilled		114,385			113,520
Allowance for doubtful accounts		(3,151	)		(2,591	)
Contract receivables, net	$	278,795		$	281,365

Note 3 - Property and Equipment (Tables)

3 Months Ended

Mar. 31, 2017

Notes Tables

Property, Plant and Equipment [Table Text Block]

	March 31, 2017			December 31, 2016
Leasehold improvements	$	17,997		$	17,847
Software		41,784			41,269
Furniture and equipment		27,385			26,570
Computers		29,805			28,874
		116,971			114,560
Accumulated depreciation and amortization		(78,252	)		(74,076	)
Total property and equipment, net	$	38,719		$	40,484

Note 7 - Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2017

Notes Tables

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

	Three Months Ended March 31 ,
	2017		201 6
Net Income	$	10,177	$	9,891

Weighted-average number of basic shares outstanding during the period		18,972		18,994
Dilutive effect of stock options, RSUs, and PSAs		451		279
Weighted-average number of diluted shares outstanding during the period		19,423		19,273

Basic earnings per share	$	0.54	$	0.52
Diluted earnings per share	$	0.52	$	0.51

Note 1 - Basis of Presentation (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)
Number of Operating Segments	1
Income Tax Expense (Benefit)	$ 4,614	$ 5,633
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	$ 6,705	$ (13,377)
Number of Reportable Segments	1
Accounting Standards Update 2016-09 [Member] \| New Accounting Pronouncement, Early Adoption, Effect [Member]
Income Tax Expense (Benefit)	$ 200
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	$ 200
Domestic [Member]
Number of Offices	55
International [Member]
Number of Offices	10

Note 1 - Basis of Presentation - Impact of Adoption on Previously Reported Results (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Provision for income taxes	$ 4,614	$ 5,633
Net income	10,177	9,891
Comprehensive income, net of tax	$ 10,549	$ 8,974
Basic earnings per share (in dollars per share)	$ 0.54	$ 0.52
Diluted earnings per share (in dollars per share)	$ 0.52	$ 0.51
Diluted weighted average shares outstanding (in shares)	19,423	19,273
Net cash used in operating activities	$ 6,705	$ (13,377)
Net cash provided by financing activities	$ (1,919)	18,724
Scenario, Previously Reported [Member]
Provision for income taxes		5,837
Net income		9,687
Comprehensive income, net of tax		$ 8,770
Basic earnings per share (in dollars per share)		$ 0.51
Diluted earnings per share (in dollars per share)		$ 0.50
Diluted weighted average shares outstanding (in shares)		19,293
Net cash used in operating activities		$ (13,581)
Net cash provided by financing activities		$ 18,928

Note 2 - Contract Receivables (Details Textual)	3 Months Ended
Note 2 - Contract Receivables (Details Textual)	Mar. 31, 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	Mar. 31, 2017	Dec. 31, 2016
Billed	$ 167,561	$ 170,436
Unbilled	114,385	113,520
Allowance for doubtful accounts	(3,151)	(2,591)
Contract receivables, net	$ 278,795	$ 281,365

Note 3 - Property and Equipment - Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Property and equipment, gross	$ 116,971	$ 114,560
Accumulated depreciation and amortization	(78,252)	(74,076)
Total property and equipment, net	38,719	40,484
Leasehold Improvements [Member]
Property and equipment, gross	17,997	17,847
Software and Software Development Costs [Member]
Property and equipment, gross	41,784	41,269
Furniture and Fixtures [Member]
Property and equipment, gross	27,385	26,570
Computer Equipment [Member]
Property and equipment, gross	$ 29,805	$ 28,874

Note 4 - Long-term Debt (Details Textual) $ in Thousands	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	May 16, 2014 USD ($)
Credit Facility Syndication, Number of Commercial Banks			11
Line of Credit Facility, Maximum Borrowing Capacity Without Borrowing Base Requirement			$ 500,000
Line of Credit Facility, Accordion Feature, Additional Revolving Credit Commitments Under Existing Loan Facility			$ 100,000
Long-term Debt, Excluding Current Maturities	$ 275,843	$ 259,389
Letters of Credit Outstanding, Amount	3,600
Line of Credit Facility, Remaining Borrowing Capacity	220,600
Line of Credit Facility, Current Borrowing Capacity	$ 173,800
Minimum [Member]
Line of Credit Facility, Fixed Charge Coverage Ratio Covenant			1.25
Maximum [Member]
Line of Credit Facility, Leverage Ratio Covenant			3.75
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			$ 30,000

Note 5 - Income Taxes (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Effective Income Tax Rate Reconciliation, Percent	31.20%	36.30%
Unrecognized Tax Benefits	$ 1.2
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	1.0
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$ 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 6 - Accounting for Stock-based Compensation (Details Textual) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	39 Months Ended
	Mar. 31, 2017	Mar. 31, 2019
Allocated Share-based Compensation Expense	$ 3.5	$ 3.2
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0.2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 41.30
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 19.1
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 219 days
Cash Settled RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0.2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 41.30
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 18.4
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	2 years 219 days
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0.1
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
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 4.5
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 292 days
Omnibus Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1.8

Note 7 - Earnings Per Share (Details Textual) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	200

Note 7 - Earnings Per Share - Dilutive Effect of Stock Options and Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net income	$ 10,177	$ 9,891
Basic (in shares)	18,972	18,994
Dilutive effect of stock options, RSUs, and PSAs (in shares)	451	279
Weighted-average number of diluted shares outstanding during the period (in shares)	19,423	19,273
Basic (in dollars per share)	$ 0.54	$ 0.52
Diluted (in dollars per share)	$ 0.52	$ 0.51

Note 8 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions	Jun. 10, 2016	Mar. 31, 2017
Community Development Related to Claim		$ 217.9
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