Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
BALANCE (in shares) at Dec. 31, 2018	15,982,622	(273,937)
BALANCE at Dec. 31, 2018	$ 16	$ (1,842)	$ 381,441	$ (336,253)	$ 43,362
Stock issued for restricted stock (in shares)	223,580
Stock issued for restricted stock	$ 1				1
Stock issued under defined contribution 401(k) retirement savings plan (in shares)	624,728
Stock issued under defined contribution 401(k) retirement savings plan			962		962
Share-based compensation			958		958
Net loss				(4,523)	(4,523)
BALANCE (in shares) at Dec. 31, 2019	16,830,930	(273,937)
BALANCE at Dec. 31, 2019	$ 17	$ (1,842)	383,361	(340,776)	40,760
Stock issued for restricted stock (in shares)	289,087
Stock issued for restricted stock
Share-based compensation			1,156		1,156
Net loss				(1,487)	(1,487)
Sale of common stock, net (in shares)	91,481
Sale of common stock, net			232		232
BALANCE (in shares) at Dec. 31, 2020	17,211,498	(273,937)
BALANCE at Dec. 31, 2020	$ 17	$ (1,842)	$ 384,749	$ (342,263)	$ 40,661