CONDENSED CONSOLIDATED STATEMENT 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)
Begining Balance (in shares) at Dec. 31, 2019		568		29,339,101
Issuance of common stock from stock option awards	(2)			$ 1		(3)
Issuance of common stock from stock options awards, shares				19,805
Stock-based compensation expense	75					75
Net income	38						38
Ending Balance at Mar. 31, 2020	11,958	$ 6		$ 294		285,171	(273,436)	(77)
Ending Balance (in shares) at Mar. 31, 2020		568		29,358,906
Beginning Balance at Dec. 31, 2019	11,847	$ 6		$ 293		285,099	(273,474)	(77)
Begining Balance (in shares) at Dec. 31, 2019		568		29,339,101
Net income	3,341
Ending Balance at Sep. 30, 2020	15,957	$ 6		$ 298		285,863	(270,133)	(77)
Ending Balance (in shares) at Sep. 30, 2020		568		29,724,037
Beginning Balance at Mar. 31, 2020	11,958	$ 6		$ 294		285,171	(273,436)	(77)
Begining Balance (in shares) at Mar. 31, 2020		568		29,358,906
Issuance of common stock from stock option awards	30			$ 1		29
Issuance of common stock from stock options awards, shares				62,550
Stock-based compensation expense	86					86
Net income	2,039						2,039
Ending Balance at Jun. 30, 2020	14,113	$ 6		$ 295		285,286	(271,397)	(77)
Ending Balance (in shares) at Jun. 30, 2020		568		29,421,456
Issuance of common stock from stock option awards	(87)			$ 1		(88)
Issuance of common stock from stock options awards, shares				97,581
Issuance of common stock	570			$ 2		568
Issuance of common stock, shares				205,000
Stock-based compensation expense	97					97
Net income	1,264						1,264
Ending Balance at Sep. 30, 2020	15,957	$ 6		$ 298		285,863	(270,133)	$ (77)
Ending Balance (in shares) at Sep. 30, 2020		568		29,724,037
Beginning Balance at Dec. 31, 2020	29,943	$ 6		$ 353		293,400	(263,816)
Begining Balance (in shares) at Dec. 31, 2020		568		35,281,183
Issuance of common stock from stock option awards	(120)			$ 4		(124)
Issuance of common stock from stock options awards, shares				366,294
Stock-based compensation expense	67					67
Net income	1,032						1,032
Ending Balance at Mar. 31, 2021	30,922	$ 6		$ 357		293,343	(262,784)
Ending Balance (in shares) at Mar. 31, 2021		568		35,647,477
Beginning Balance at Dec. 31, 2020	$ 29,943	$ 6		$ 353		293,400	(263,816)
Begining Balance (in shares) at Dec. 31, 2020		568		35,281,183
Issuance of common stock from stock options awards, shares	1,895,437
Net income	$ 2,093
Ending Balance at Sep. 30, 2021	31,584	$ 6		$ 366		292,935	(261,723)
Ending Balance (in shares) at Sep. 30, 2021		565		36,574,702
Beginning Balance at Mar. 31, 2021	30,922	$ 6		$ 357		293,343	(262,784)
Begining Balance (in shares) at Mar. 31, 2021		568		35,647,477
Issuance of common stock from stock option awards	(670)			$ 6		(676)
Issuance of common stock from stock options awards, shares				611,905
Issuance of restricted common stock	76					76
Restricted stock units issued, shares				25,000
Stock-based compensation expense	68					68
Net income	587						587
Ending Balance at Jun. 30, 2021	30,983	$ 6		$ 363		292,811	(262,197)
Ending Balance (in shares) at Jun. 30, 2021		568		36,284,382
Issuance of common stock from stock option awards	25			$ 3		22
Issuance of common stock from stock options awards, shares				290,200
Issuance of common stock due to conversion of Series N Preferred stock, shares			(3)		120
Stock-based compensation expense	102					102
Net income	474						474
Ending Balance at Sep. 30, 2021	$ 31,584	$ 6		$ 366		$ 292,935	$ (261,723)
Ending Balance (in shares) at Sep. 30, 2021		565		36,574,702