CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Beginning balance at Dec. 31, 2019	$ 115	$ 32,604	$ 25,348		$ (31)	$ 25,926
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense		187
Issuance of shares from exercise of stock options	1	353
Relinquishment of stock awards and deferred stock units to pay for withholding taxes		(41)
Net loss			(992)			(992)
Foreign currency translation adjustment, net of tax					71	71
Ending balance at Mar. 31, 2020	116	33,103	24,356	$ (32,110)	40	$ 25,505
Supplemental share information
Issuance of shares from stock awards (in shares)						83
Relinquishment of stock awards to pay withholding taxes (in shares)						14
Beginning balance at Dec. 31, 2020	130	42,536	19,718		(38)	$ 30,236
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense		264
Issuance of shares from exercise of stock options	0	91
Relinquishment of stock awards and deferred stock units to pay for withholding taxes		(75)
Net loss			(2,206)			(2,206)
Foreign currency translation adjustment, net of tax					53	53
Ending balance at Mar. 31, 2021	$ 130	$ 42,816	$ 17,512	$ (32,110)	$ 15	$ 28,363
Supplemental share information
Issuance of shares from stock awards (in shares)						65
Relinquishment of stock awards to pay withholding taxes (in shares)						31