Note 12 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

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

	Year Ended December 31,
	2019			2018			2017
United States	$	(4,134	)	$	(13,151	)	$	(19,115	)
Foreign		117,254			131,633			102,059
Income before income taxes	$	113,120		$	118,482		$	82,944

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

	Year Ended December 31,
	2019			2018			2017
Current:
Federal	$	1,682		$	11,023		$	31,025
State		8			4			2
Foreign		3,105			2,992			1,967
Deferred:
Federal		(213	)		(797	)		(15,426	)
Foreign		(301	)		(8	)		173
Income tax expense	$	4,281		$	13,214		$	17,741

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

	Year Ended December 31,
	2019			2018			2017
U.S. statutory federal tax rate		21.0	%		21.0	%		35.0	%
Foreign income at lower rates		(20.7	)		(22.0	)		(41.2	)
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”)		11.0			14.4			-
Changes in valuation allowance		2.1			-			(36.2	)
Stock-based compensation		(1.5	)		(1.1	)		2.2
Tax credits		(6.2	)		(1.9	)		(2.1	)
Other adjustments		(1.9	)		0.2			1.4
Effective tax rate		3.8	%		11.2	%		21.4	%

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

	December 31,
	2019			2018
Deferred tax assets:
Tax credits	$	18,080		$	11,833
Stock-based compensation		6,237			10,040
Deferred compensation		7,110			6,829
Net operating losses		615			1,133
Other expenses not currently deductible		2,323			1,852
Deferred tax assets, gross		34,365			31,687
Valuation allowance		(15,411	)		(13,041	)
Deferred tax assets, net of valuation allowance		18,954			18,646
Deferred tax liabilities:
Depreciation and amortization		(1,259	)		(711	)
Undistributed foreign earnings		(77	)		(1,105	)
Other expenses currently deductible		(425	)		-
Deferred tax liabilities		(1,761	)		(1,816	)
Net deferred tax assets	$	17,193		$	16,830

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

Balance as of January 1, 2017	$	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
Increase for tax position of prior year		1,589
Increase for tax position of current year		4,663
Decrease due to settlement with tax authorities		(560	)
Decrease due to lapse of statute of limitation		(776	)
Balance as of December 31, 2019	$	25,407