Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common stock	Treasury stock	Additional paid-in capital	Accum other comp inc.	Accum deficit	Total
Balance at Dec. 31, 2018	$ 29	$ (12,213)	$ 375,979	$ (2)	$ (329,193)	$ 34,600
Balance (in Shares) at Dec. 31, 2018	2,919,542	(185,941)
Stock-based compensation			508			508
Restricted stock issued			15			15
Restricted stock issued (in Shares)	2,538
Common stock issued, net of shares withheld for employee taxes			(196)			(196)
Common stock issued, net of shares withheld for employee taxes (in Shares)	33,173
Purchase of treasury stock, at cost		$ (536)				(536)
Purchase of treasury stock, at cost (in Shares)		(67,141)
Unrealized gain on investments net of taxes				1		1
Net loss					(1,147)	(1,147)
Balance at Dec. 31, 2019	$ 29	$ (12,749)	376,306	(1)	(330,340)	33,245
Balance (in Shares) at Dec. 31, 2019	2,955,253	(253,082)
Stock-based compensation			168			168
Restricted stock issued			30			30
Restricted stock issued (in Shares)	3,597
Common stock issued, net of shares withheld for employee taxes			(48)			(48)
Common stock issued, net of shares withheld for employee taxes (in Shares)	12,433
Purchase of treasury stock, at cost		$ (2,398)				(2,398)
Purchase of treasury stock, at cost (in Shares)		(295,946)
Unrealized gain on investments net of taxes				1		1
Net loss					(1,063)	(1,063)
Balance at Dec. 31, 2020	$ 29	$ (15,147)	$ 376,456		$ (331,403)	$ 29,935
Balance (in Shares) at Dec. 31, 2020	2,971,283	(549,028)