Note 12 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

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

	Year Ended December 31,
	2018			2017			2016
United States	$	(13,151	)	$	(19,115	)	$	(14,431	)
Foreign		131,633			102,059			71,695
Income before income taxes	$	118,482		$	82,944		$	57,264

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

	Year Ended December 31,
	2018			2017			2016
Current:
Federal	$	11,023		$	31,025		$	2,527
State		4			2			-
Foreign		2,992			1,967			2,013
Deferred:
Federal		(797	)		(15,426	)		-
Foreign		(8	)		173			4
Income tax provision	$	13,214		$	17,741		$	4,544

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

	Year Ended December 31,
	2018			2017			2016
U.S. statutory federal tax rate		21.0	%		35.0	%		34.0	%
Foreign income at lower rates		(22.0	)		(41.2	)		(41.1	)
Impact of the 2017 Tax Act:
Remeasurement of deferred taxes		-			11.8			-
One-time deemed repatriation transition tax		0.6			50.5			-
Global intangible low-taxed income ("GILTI")		14.4			-			-
Changes in valuation allowance		-			(36.2	)		11.0
Stock-based compensation		(1.1	)		2.2			2.2
Other adjustments		(1.7	)		(0.7	)		1.8
Effective tax rate		11.2	%		21.4	%		7.9	%

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

	December 31,
	2018			2017
Deferred tax assets:
R&D tax credits	$	11,833		$	10,331
Stock-based compensation		10,040			9,157
Deferred compensation		6,829			5,505
Depreciation and amortization		-			191
Net operating losses		1,133			1,377
Other expenses not currently deductible		1,852			1,924
Deferred tax assets, gross		31,687			28,485
Valuation allowance		(13,041	)		(12,568	)
Deferred tax assets, net of valuation allowance		18,646			15,917
Deferred tax liabilities:
Depreciation and amortization		(711	)		-
Undistributed foreign earnings		(1,105	)		-
Deferred tax liabilities		(1,816	)		-
Net deferred tax assets	$	16,830		$	15,917

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

Balance as of January 1, 2016	$	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 statute of limitation		(688	)
Balance as of December 31, 2017		16,272
Increase for tax position of prior year		1,474
Increase for tax position of current year		2,957
Decrease due to lapse of statute of limitation		(212	)
Balance as of December 31, 2018	$	20,491