CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning Balance at Dec. 31, 2017	$ 3,488	$ 6	$ 285	$ 284,396	$ (281,124)	$ (75)
Balance (in shares) at Dec. 31, 2017		569	28,480,148
Issuance of common stock from stock option awards	$ 74	$ 0	$ 2	72	0	0
Issuance of common stock from stock options awards, shares	173,130		173,130
Issuance of restricted common stock	$ 0	0	$ 6	(6)	0	0
Issuance of restricted common stock, shares			600,000
Stock-based compensation expense	289	0	$ 0	289	0	0
Net income	3,751	0	0	0	3,751	0
Foreign currency translation adjustment	(2)	0	0	0	0	(2)
Ending 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	$ 65	0	$ 0	65	0	0
Issuance of common stock, shares			75,000
Stock-based compensation expense	283	0	$ 0	283	0	0
Net income	3,899	0	0	0	3,899	0
Foreign currency translation adjustment	0
Ending Balance at Dec. 31, 2019	$ 11,847	$ 6	$ 293	$ 285,099	$ (273,474)	$ (77)
Balance (in shares) at Dec. 31, 2019		569	29,339,061