Note 12 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

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

	Year Ended December 31,
	2020		2019			2018
United States	$	39,286	$	(4,134	)	$	(13,151	)
Foreign		130,056		117,254			131,633
Income before income taxes	$	169,342	$	113,120		$	118,482

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

	Year Ended December 31,
	2020			2019			2018
Current:
Federal	$	2,842		$	1,682		$	11,023
State		(1	)		8			4
Foreign		3,814			3,105			2,992
Deferred:
Federal		(1,221	)		(213	)		(797	)
Foreign		(467	)		(301	)		(8	)
Income tax expense	$	4,967		$	4,281		$	13,214

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

	Year Ended December 31,
	2020			2019			2018
U.S. statutory federal tax rate		21.0	%		21.0	%		21.0	%
Foreign income at lower rates		(15.2	)		(20.7	)		(22.0	)
Impact of the 2017 Tax Act:
One-time deemed repatriation transition tax		-			-			0.6
GILTI		11.1			11.0			14.4
Changes in valuation allowance		1.6			2.1			-
Stock-based compensation		(11.2	)		(1.5	)		(1.1	)
Tax credits, net of reserves		(3.8	)		(6.2	)		(1.9	)
State income taxes		(1.6	)		(0.7	)		-
Other adjustments		1.0			(1.2	)		0.2
Effective tax rate		2.9	%		3.8	%		11.2	%

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

	December 31,
	2020			2019
Deferred tax assets:
Tax credits	$	23,501		$	18,080
Stock-based compensation		2,392			6,237
Deferred compensation		7,895			7,110
Net operating losses		1,150			615
Other expenses not currently deductible		4,617			2,323
Deferred tax assets, gross		39,555			34,365
Valuation allowance		(18,190	)		(15,411	)
Deferred tax assets, net of valuation allowance		21,365			18,954
Deferred tax liabilities:
Depreciation and amortization		(1,600	)		(1,259	)
Undistributed foreign earnings		(77	)		(77	)
Other expenses currently deductible		(1,132	)		(425	)
Deferred tax liabilities		(2,809	)		(1,761	)
Net deferred tax assets	$	18,556		$	17,193

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

Balance as of January 1, 2018	$	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
Increase for tax position of current year		9,782
Decrease for tax position of prior year		(907	)
Decrease due to settlement with tax authorities		(560	)
Decrease due to lapse of statute of limitation		(223	)
Balance as of December 31, 2020	$	33,499