Note 12 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]

	Year Ended December 31,
	2017			2016			2015
United States	$	(19,115	)	$	(14,431	)	$	(247	)
Foreign		102,059			71,695			42,738
Total income before income taxes	$	82,944		$	57,264		$	42,491

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	Year Ended December 31,
	2017			2016		2015
Current:
Federal	$	31,025		$	2,527	$	6,042
State		2			-		2
Foreign		1,967			2,013		1,213
Deferred:
Federal		(15,426	)		-		-
Foreign		173			4		62
Total income tax provision	$	17,741		$	4,544	$	7,319

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	Year Ended December 31,
	2017			2016			2015
U.S. statutory federal tax rate		35.0	%		34.0	%		34.0	%
Settlement with tax authorities		-			-			6.2
Foreign income at lower rates		(41.2	)		(41.1	)		(43.1	)
Impact of the 2017 Tax Act:
One-time deemed repatriation transition tax		50.5			-			-
Remeasurement of deferred taxes		11.8			-			-
Changes in valuation allowance		(36.2	)		11.0			17.6
Stock-based compensation		2.2			2.2			-
Other adjustments		(0.7	)		1.8			2.5
Effective tax rate		21.4	%		7.9	%		17.2	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	December 31,
	2017			2016
Deferred tax assets:
R&D tax credits	$	10,331		$	9,817
Stock-based compensation		9,157			7,283
Deferred compensation		5,505			6,752
Depreciation and amortization		191			161
Net operating losses		1,377			-
Other expenses not currently deductible		1,924			3,974
Total deferred tax assets		28,485			27,987
Valuation allowance		(12,568	)		(27,354	)
Net deferred tax assets	$	15,917		$	633

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

Balance as of January 1, 2015	$	16,406
Increase for tax position of current year		1,964
Decrease related to settlement with tax authorities		(4,162	)
Decrease due to lapse of statue of limitation		(669	)
Decrease for tax position of prior year		(1,446	)
Balance as of December 31, 2015		12,093
Increase for tax position of prior year		243
Increase for tax position of current year		2,095
Balance as of December 31, 2016		14,431
Increase for tax position of prior year		169
Increase for tax position of current year		2,360
Decrease due to lapse of statue of limitation		(688	)
Balance as of December 31, 2017	$	16,272