CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Preferred Stock [Member] Series N Preferred Stock [Member]	Common Stock [Member]	Common Stock [Member] Series N Preferred Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning Balance at Dec. 31, 2019	$ 11,847	$ 6		$ 293		$ 285,099	$ (273,474)	$ (77)
Balance (in shares) at Dec. 31, 2019		568		29,339,101
Issuance of common stock from stock option awards	$ (103)			$ 4		(107)
Issuance of common stock from stock options awards, shares	383,350			274,582
Issuance of common stock for services rendered	$ 570			$ 2		568
Issuance of common stock for services rendered, shares				205,000
Issuance of common stock in public offering, net	7,541			$ 54		7,487
Issuance of common stock in public offering, net, shares				5,462,500
Stock-based compensation expense	353					353
Net income	9,658						9,658
Foreign currency translation adjustments	77							$ 77
Ending Balance at Dec. 31, 2020	29,943	$ 6		$ 353		293,400	(263,816)
Balance (in shares) at Dec. 31, 2020		568		35,281,183
Issuance of common stock from stock option awards	$ (765)			$ 13		(778)
Issuance of common stock from stock options awards, shares	1,895,437			1,268,399
Issuance of restricted common stock, shares				25,000
Issuance of restricted common stock	$ 76					76
Issuance of common stock due to conversion of Series N Preferred stock, shares			(3)		120
Stock-based compensation expense	332					332
Net income	3,053						3,053
Ending Balance at Dec. 31, 2021	$ 32,639	$ 6		$ 366		$ 293,030	$ (260,763)
Balance (in shares) at Dec. 31, 2021		565		36,574,702