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		413
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			(2,845)			(2,845)
Foreign currency translation adjustment, net of tax					81	81
Ending balance at Jun. 30, 2020	116	33,329	22,503	$ (32,110)	50	$ 23,888
Supplemental share information
Issuance of shares from stock awards (in shares)						91
Relinquishment of stock awards to pay withholding taxes (in shares)						14
Beginning balance at Mar. 31, 2020	116	33,103	24,356		40	$ 25,505
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense		226
Issuance of shares from exercise of stock options	0	0
Relinquishment of stock awards and deferred stock units to pay for withholding taxes		0
Net loss			(1,853)			(1,853)
Foreign currency translation adjustment, net of tax					10	10
Ending balance at Jun. 30, 2020	116	33,329	22,503	(32,110)	50	$ 23,888
Supplemental share information
Issuance of shares from stock awards (in shares)						9
Relinquishment of stock awards to pay withholding taxes (in shares)						0
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		695
Issuance of shares from exercise of stock options	0	277
Relinquishment of stock awards and deferred stock units to pay for withholding taxes		(100)
Net loss			(4,320)			(4,320)
Foreign currency translation adjustment, net of tax					85	85
Ending balance at Jun. 30, 2021	130	43,408	15,398	(32,110)	47	$ 26,873
Supplemental share information
Issuance of shares from stock awards (in shares)						92
Relinquishment of stock awards to pay withholding taxes (in shares)						32
Beginning balance at Mar. 31, 2021	130	42,816	17,512		15	$ 28,363
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense		431
Issuance of shares from exercise of stock options	0	186
Relinquishment of stock awards and deferred stock units to pay for withholding taxes		(25)
Net loss			(2,114)			(2,114)
Foreign currency translation adjustment, net of tax					32	32
Ending balance at Jun. 30, 2021	$ 130	$ 43,408	$ 15,398	$ (32,110)	$ 47	$ 26,873
Supplemental share information
Issuance of shares from stock awards (in shares)						27
Relinquishment of stock awards to pay withholding taxes (in shares)						1