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Note 12 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

		Year Ended December 31,
		2021				2020				2019
		(in thousands)
Domestic		$	80,472			$	94,099			$	72,124
Foreign			8,925				7,938				7,859
Income before income taxes		$	89,397			$	102,037			$	79,983

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

		Year Ended December 31,
		2021				2020				2019
		(in thousands)
Current
Federal		$	20,135			$	1,944			$	(90	)
State			4,324				1,438				646
Foreign			3,701				3,571				3,000
Current income tax provision			28,160				6,953				3,556
Deferred
Federal			(7,342	)			4,239				7,085
State			(1,722	)			26				447
Foreign			(659	)			(753	)			(441	)
Deferred income tax provision (benefit)			(9,723	)			3,512				7,091
Income tax provision		$	18,437			$	10,465			$	10,647

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

		Year Ended December 31,
		2021				2020				2019
Federal statutory rate			21.0	%			21.0	%			21.0	%
State taxes			3.1				1.6				1.5
Stock-based compensation			10.3				4.8				4.0
Excess tax benefits related to stock-based compensation			(5.4	)			(13.8	)			(11.2	)
Foreign source income			0.4				0.2				0.1
Change in valuation allowance			0.2				0.8				1.1
Foreign-derived intangible income deduction			(7.0	)			(1.7	)			—
Federal and state research and development credit			(1.9	)			(2.6	)			(3.7	)
Other			(0.1	)			—				0.4
Income tax provision			20.6	%			10.3	%			13.2	%

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

		December 31,
		2021				2020
		(in thousands)
Deferred tax assets
Research and development credit carryforwards		$	10,743			$	16,965
Foreign tax credit carryforwards			933				3,497
Accrued liabilities			1,655				2,019
Deferred revenues			7,250				5,123
Operating lease liabilities			11,777				15,924
Intangible assets			12,377				1,397
Stock-based compensation			4,085				3,907
Other			2,987				720
Gross deferred tax assets			51,807				49,552
Valuation allowance			(11,364	)			(11,188	)
Net deferred tax assets			40,443				38,364
Deferred tax liabilities
Fixed assets			(3,320	)			(7,017	)
Operating leases - right of use asset			(9,010	)			(13,054	)
Deferred commissions			(3,026	)			(2,482	)
Total deferred tax liabilities			(15,356	)			(22,553	)
Net deferred tax assets		$	25,087			$	15,811

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

		Year Ended December 31,
		2021				2020				2019
		(in thousands)
Unrecognized tax benefits beginning balance		$	8,855			$	7,778			$	6,406
Gross increase for tax positions of prior years			—				4				—
Gross decrease for tax positions of prior years			(25	)			—				(12	)
Gross increase for tax positions of current year			846				1,258				1,384
Lapse of statute of limitations			—				(185	)			—
Total unrecognized tax benefits		$	9,676			$	8,855			$	7,778

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