CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Series D and E Preferred Stock	Preferred Stock Series A-2 Preferred Stock	Preferred Stock Series C Preferred Stock	Preferred Stock Series D Preferred Stock	Preferred Stock Series E Preferred Stock	Common Stock	Common Stock Series A-2 Preferred Stock	Common Stock Series D and E Preferred Stock	Treasury Stock	Additional Paid-In Capital	Additional Paid-In Capital Series D and E Preferred Stock	Accumulated Deficit
Beginning Balance (in shares) at Dec. 31, 2019			32	475	1,734,901	131,579	5,266,828			105,285
Beginning Balance at Dec. 31, 2019	$ 21,785		$ 0	$ 0	$ 0	$ 0	$ 1			$ (165)	$ 207,383		$ (185,434)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(3,129)												(3,129)
Stock-based compensation	32										32
Preferred stock conversion (in shares)				(150)			50,000
Issuance of preferred stock for accrued dividends (in shares)			13
Issuance of preferred stock for accrued dividends	98										98
Forfeited restricted stock (in shares)					14,441
Preferred stock dividends	(4)										(4)
Purchase of treasury stock	(7)									$ (7)
Ending Balance (in shares) at Mar. 31, 2020			45	325	1,720,460	131,579	5,316,828			105,285
Ending Balance at Mar. 31, 2020	18,775		$ 0	$ 0	$ 0	$ 0	$ 1			$ (172)	207,509		(188,563)
Beginning Balance (in shares) at Dec. 31, 2019			32	475	1,734,901	131,579	5,266,828			105,285
Beginning Balance at Dec. 31, 2019	$ 21,785		$ 0	$ 0	$ 0	$ 0	$ 1			$ (165)	207,383		(185,434)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation										$ (16)
Forfeited restricted stock (in shares)	0
Series D Preferred Stock exchanged for taxes (in shares)										(8,000)
Ending Balance (in shares) at Dec. 31, 2020			45		1,697,958	131,579	7,861,912			113,283
Ending Balance at Dec. 31, 2020	$ 22,057		$ 0		$ 0	$ 0	$ 1			$ (181)	215,092		(192,855)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(3,433)												(3,433)
Stock-based compensation	33										33
Preferred stock conversion (in shares)			(45)		(1,697,022)	(131,579)	18,846,411	84,292	18,762,119
Preferred stock conversion		$ 0							$ 2			$ (2)
Issuance of stock for services (in shares)							21,008
Issuance of stock for services	274										274
Forfeited restricted stock (in shares)					(81)
Series D Preferred Stock exchanged for taxes (in shares)					(855)
Ending Balance (in shares) at Mar. 31, 2021			0		0	0	26,729,331			113,283
Ending Balance at Mar. 31, 2021	$ 18,931		$ 0		$ 0	$ 0	$ 3			$ (181)	$ 215,397		$ (196,288)