Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2018		12,777,573
Balance at Dec. 31, 2018		$ 138,280	$ (926)	$ (119,013)	$ 18,341
Net loss					(2,846)
Balance at Mar. 31, 2019					15,673
Balance (in shares) at Dec. 31, 2018		12,777,573
Balance at Dec. 31, 2018		$ 138,280	(926)	(119,013)	$ 18,341
Exercise of stock options (in shares)		264,720
Exercise of stock options
Share-based compensation, including issuance of restricted stock (in shares)
Share-based compensation, including issuance of restricted stock		$ 519			519
Shares of restricted stock withheld for taxes (in shares)
Shares of restricted stock withheld for taxes		$ (24)			(24)
Net loss				(9,181)	(9,181)
Foreign currency translation adjustment, net of tax			(63)		39
Foreign currency translation adjustment, net of tax		102
Unrealized gain on investments, net of tax			2		2
Balance (in shares) at Dec. 31, 2019		13,042,293
Balance at Dec. 31, 2019		$ 138,877	(987)	(128,194)	9,696
Balance at Mar. 31, 2019					15,673
Net loss					(3,868)
Balance at Jun. 30, 2019					11,835
Net loss					(1,107)
Balance at Sep. 30, 2019					10,888
Net loss					(1,360)
Balance (in shares) at Dec. 31, 2019		13,042,293
Balance at Dec. 31, 2019		$ 138,877	(987)	(128,194)	9,696
Net loss					(474)
Balance at Mar. 31, 2020					9,401
Balance (in shares) at Dec. 31, 2019		13,042,293
Balance at Dec. 31, 2019		$ 138,877	(987)	(128,194)	$ 9,696
Exercise of stock options (in shares)		192,745			26,250
Exercise of stock options		$ (1)			$ (1)
Share-based compensation, including issuance of restricted stock (in shares)
Share-based compensation, including issuance of restricted stock		$ 812			812
Shares of restricted stock withheld for taxes (in shares)
Shares of restricted stock withheld for taxes
Net loss				(1,889)	(1,889)
Foreign currency translation adjustment, net of tax			(12)		26
Foreign currency translation adjustment, net of tax		38
Unrealized gain on investments, net of tax			7		7
Balance (in shares) at Dec. 31, 2020		13,235,038
Balance at Dec. 31, 2020		$ 139,726	(992)	(130,083)	8,651
Balance at Mar. 31, 2020					9,401
Net loss					(1,073)
Balance at Jun. 30, 2020					8,432
Net loss					(136)
Balance at Sep. 30, 2020					8,622
Net loss					(206)
Balance (in shares) at Dec. 31, 2020		13,235,038
Balance at Dec. 31, 2020		$ 139,726	$ (992)	$ (130,083)	$ 8,651