CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Series N Preferred Stock [Member]	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]	Additional Paid-In Capital [Member] Series N Preferred Stock [Member]	Accumulated Deficit [Member]	Accumulated Deficit [Member] Series N Preferred Stock [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Other Comprehensive Loss [Member] Series N Preferred Stock [Member]
Beginning Balance at Dec. 31, 2018	$ 7,600		$ 6		$ 293		$ 284,751		$ (277,373)		$ (77)
Balance (in shares) at Dec. 31, 2018			569		29,253,278
Issuance of common stock from stock option awards	$ 0		$ 0		$ 0		0		0		0
Issuance of common stock from stock options awards, shares	31,276				10,783
Issuance of common stock for services rendered	$ 65		0		$ 0		65		0		0
Issuance of common stock for services rendered, shares					75,000
Issuance of common stock due to conversion of Series N Preferred stock		$ 0		$ 0		$ 0		$ 0		$ 0		$ 0
Issuance of common stock due to conversion of Series N Preferred stock, shares				(1)		40
Stock-based compensation expense	283		0		$ 0		283		0		0
Net income	3,899		0		0		0		3,899		0
Ending 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)		$ 0		$ 4		(107)		0		0
Issuance of common stock from stock options awards, shares	383,350				274,582
Issuance of common stock for services rendered	$ 570		0		$ 2		568		0		0
Issuance of common stock for services rendered, shares					205,000
Issuance of common stock in public offering, net	7,541		0		$ 54		7,487		0		0
Issuance of common stock in public offering, net, shares					5,462,500
Stock-based compensation expense	353		0		$ 0		353		0		0
Net income	9,658		0		0		0		9,658		0
Foreign currency translation adjustments	77		0		0		0		0		77
Ending Balance at Dec. 31, 2020	$ 29,943		$ 6		$ 353		$ 293,400		$ (263,816)		$ 0
Balance (in shares) at Dec. 31, 2020			568		35,281,183