Condensed Consolidated Statements of Stockholders' Equity (unaudited) - 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	882	0	882	0	0
Issuance of shares for stock purchase plans and stock options	338	0	338	0	0
Cancellation of shares for payment of withholding tax	(743)	0	(743)	0	0
Dividends paid	(1,016)	0	(1,016)	0	0
Net loss	(317)	0	0	(317)	0
Change in cumulative translation adjustment, net	153	0	0	0	153
BALANCE at end of year at Mar. 31, 2019	68,903	18	133,320	(64,372)	(63)
BALANCE at beginning of year at Dec. 31, 2019	73,350	19	133,954	(60,305)	(318)
Stock-based compensation expense	562	0	562	0	0
Issuance of shares for stock purchase plans and stock options	59	0	59	0	0
Cancellation of shares for payment of withholding tax	(1,106)	0	(1,106)	0	0
Repurchase of common stock	(2,000)	(1)	(1,999)	0	0
Dividends paid	(1,032)	0	(1,032)	0	0
Net loss	(688)	0	0	(688)	0
Change in cumulative translation adjustment, net	(89)	0	0	0	(89)
BALANCE at end of year at Mar. 31, 2020	$ 69,056	$ 18	$ 130,438	$ (60,993)	$ (407)