Note 11 - Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred Tax Assets
Allowance for bad debt	$ 1,008	$ 831
Accrued paid time off	2,592	2,416
Accrued bonus	55	149
Foreign net operating loss (NOL) carry forward	1,371	933
Federal/state net operating loss (NOL) carry forward	3,010	6,458
Stock option compensation	4,292	4,792
Deferred rent	5,423	5,376
Deferred compensation	3,662	2,908
Foreign tax credits	2,631	1,914
Foreign exchange	5,349	1,879
Accrued liabilities and other	3,378	2,643
	34,780	31,863
Less: Valuation Allowance	(1,131)	(933)
Total Deferred Tax Assets	33,649	30,930
Deferred Tax Liabilities
Retention	(1,684)	(1,860)
Prepaid expenses	(1,654)	(1,040)
Payroll taxes	(617)	(502)
Unbilled revenue	(8,728)	(8,093)
Depreciation	(6,664)	(7,186)
Amortization	(51,842)	(44,867)
Deferred gain and other	(1,574)	(708)
Total Deferred Tax Liabilities	(72,763)	(64,256)
Total Net Deferred Tax Liability	(39,114)	(33,326)
State and Local Jurisdiction [Member]
Deferred Tax Assets
State tax credits	1,784	1,339
United States Government [Member]
Deferred Tax Assets
State tax credits	$ 225	$ 225