Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid - In Capital [Member]	Retained Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
BALANCE at beginning of year at Dec. 31, 2019	$ 73,350	$ 19	$ 133,954	$ (60,305)	$ (318)
Stock-based compensation expense	2,479	0	2,479	0	0
Issuance of shares for stock purchase and option plans	869	0	869	0	0
Cancellation of shares for payment of withholding tax	(1,137)	0	(1,137)	0	0
Repurchase of common stock	(3,808)	(1)	(3,807)	0	0
Dividends paid	(4,108)	0	(4,108)	0	0
Net income	3,417	0	0	3,417	0
Change in cumulative translation adjustment, net	336	0	0	0	336
BALANCE at end of year at Dec. 31, 2020	71,398	18	128,250	(56,888)	18
Stock-based compensation expense	2,921	1	2,920	0	0
Issuance of shares for stock purchase and option plans	840	0	840	0	0
Cancellation of shares for payment of withholding tax	(786)	0	(786)	0	0
Repurchase of common stock	(3,193)	(1)	(3,192)	0	0
Dividends paid	(4,034)	0	(4,034)	0	0
Net income	153	0	0	153	0
Change in cumulative translation adjustment, net	(378)	0	0	0	(378)
BALANCE at end of year at Dec. 31, 2021	$ 66,921	$ 18	$ 123,998	$ (56,735)	$ (360)