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, 2019		13,042,293
Balance at Dec. 31, 2019		$ 138,877	$ (987)	$ (128,117)	$ 9,773
Net loss					(474)
Balance (in shares) at Dec. 31, 2019		13,042,293
Balance at Dec. 31, 2019		$ 138,877	(987)	(128,117)	$ 9,773
Exercise of stock options (in shares)		192,745			26,250
Exercise of stock options		$ (1)			$ 1
Exercise of stock options		1			(1)
Stock-based compensation, including issuance of restricted stock	$ 0	812	0	0	812
Net loss				(1,889)	(1,889)
Foreign currency translation, net of tax		38	(12)		26
Unrealized gain on investments, net of tax	$ 0	$ 0	7	0	7
Balance (in shares) at Dec. 31, 2020		13,235,038
Balance at Dec. 31, 2020		$ 139,726	(992)	(130,006)	8,728
Net loss					(1,073)
Net loss					(136)
Net loss					(206)
Balance (in shares) at Dec. 31, 2020		13,235,038
Balance at Dec. 31, 2020		$ 139,726	(992)	(130,006)	8,728
Net loss					(860)
Balance at Mar. 31, 2021					7,963
Balance (in shares) at Dec. 31, 2020		13,235,038
Balance at Dec. 31, 2020		$ 139,726	(992)	(130,006)	$ 8,728
Exercise of stock options (in shares)	0	37,380			36,130
Exercise of stock options	$ 0	$ (68)	0	0	$ (68)
Exercise of stock options	0	68	0	0	68
Stock-based compensation, including issuance of restricted stock	0	674	0	0	674
Net loss	0	$ 0	0	(2,242)	(2,242)
Foreign currency translation, net of tax					(39)
Unrealized gain on investments, net of tax					0
Vesting of restricted stock awards (in shares)		199,311
Sale of common stock (in shares)		6,902,677
Sale of common stock		$ 31,936			31,936
Foreign currency translation adjustment, net of tax	$ 0		(32)	0	(39)
Foreign currency translation adjustment, net of tax		$ (7)
Balance (in shares) at Dec. 31, 2021	0	20,374,406
Balance at Dec. 31, 2021	$ 0	$ 172,397	(1,024)	(132,248)	39,125
Balance at Mar. 31, 2021					7,963
Net loss					$ 293
Sale of common stock (in shares)					108,879
Balance at Jun. 30, 2021					$ 8,886
Net loss					$ (895)
Sale of common stock (in shares)					6,793,798
Balance at Sep. 30, 2021					$ 39,836
Net loss					(780)
Balance (in shares) at Dec. 31, 2021	0	20,374,406
Balance at Dec. 31, 2021	$ 0	$ 172,397	$ (1,024)	$ (132,248)	$ 39,125