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, 2018	$ 69,606	$ 18	$ 133,859	$ (64,055)	$ (216)
Stock-based compensation expense	4,133	0	4,133	0	0
Issuance of shares for stock purchase and option plans	1,183	1	1,182	0	0
Cancellation of shares for payment of withholding tax	(1,152)	0	(1,152)	0	0
Dividends paid	(4,068)	0	(4,068)	0	0
Net income (loss)	3,750	0	0	3,750	0
Change in cumulative translation adjustment, net	(102)	0	0	0	(102)
BALANCE at end 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 (loss)	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