Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2018	26,984,747
Balance at beginning of period at Dec. 31, 2018	$ 27	$ 258,502	$ 291,460	$ (8,492)	$ 541,497
Common shares issued on exercise of options and other, net of shares withheld for tax obligations (in shares)	128,174
Common shares issued on exercise of options and other, net of shares withheld for tax obligations		1,904			1,904
Stock-based compensation expense		10,781			10,781
Repurchases of Common Stock (in shares)	(326,462)
Net income			63,655		63,655
Foreign currency translation adjustment				1,474	1,474
Comprehensive income (loss)					65,129
Foreign currency translation adjustments				1,474	1,474
Net unrealized gains (losses) on investments in securities					0
Balance (in shares) at Dec. 31, 2019	26,786,459
Balance at end of period at Dec. 31, 2019	$ 27	268,059	324,722	(7,018)	585,790
Common shares issued on exercise of options and other, net of shares withheld for tax obligations (in shares)	189,951
Common shares issued on exercise of options and other, net of shares withheld for tax obligations		4,114			4,114
Stock-based compensation expense		14,673			14,673
Repurchases of Common Stock (in shares)	(199,614)
Net income			50,867		50,867
Foreign currency translation adjustment				3,598	3,598
Comprehensive income (loss)					54,465
Repurchases of Common Stock		(1,998)	(12,688)		(14,686)
Foreign currency translation adjustments				3,598	3,598
Net unrealized gains (losses) on investments in securities					$ 0
Balance (in shares) at Dec. 31, 2020	26,776,796				26,776,796
Balance at end of period at Dec. 31, 2020	$ 27	284,848	362,901	(3,420)	$ 644,356
Common shares issued on exercise of options and other, net of shares withheld for tax obligations	$ 0	1,637	0	0	1,637
Stock-based compensation expense		19,095			19,095
Repurchases of Common Stock (in shares)	(351,582)
Net income			33,372		33,372
Foreign currency translation adjustment				(13,278)	(13,278)
Comprehensive income (loss)					19,975
Repurchases of Common Stock		(3,740)	(19,539)		(23,279)
Common shares issued for Hubs acquisition (in shares)	863,995
Common shares issued for Hubs acquisition	$ 1	166,708			166,709
Foreign currency translation adjustments				(13,278)	(13,278)
Net unrealized gains (losses) on investments in securities				(119)	$ (119)
Balance (in shares) at Dec. 31, 2021	27,465,945				27,465,945
Balance at end of period at Dec. 31, 2021	$ 28	$ 468,548	$ 376,734	$ (16,817)	$ 828,493