Condensed Consolidated Statements of Stockholders’ Equity - USD ($) $ in Thousands	Common stock	Treasury stock	Additional paid-in capital	Accum other comp loss	Accum deficit	Total
Balance at Dec. 31, 2018	$ 29	$ (12,213)	$ 375,979	$ (2)	$ (329,193)	$ 34,600
Balance, Shares at Dec. 31, 2018	2,919,542	(185,941)
Stock-based compensation			20			20
Stock-based compensation, shares
Common stock issued, net of shares withheld for employee taxes			36			36
Common stock issued, net of shares withheld for employee taxes, Shares	6,415
Purchase of treasury stock, at cost		$ (501)				(501)
Purchase of treasury stock, at cost, Shares		(62,849)
Unrealized gain (loss) on investments, net of tax				3		3
Net loss					(780)	(780)
Balance at Jun. 30, 2019	$ 29	$ (12,714)	376,035	1	(329,973)	33,378
Balance, Shares at Jun. 30, 2019	2,925,957	(248,790)
Stock-based compensation			8			8
Stock-based compensation, shares
Common stock issued, net of shares withheld for employee taxes			264			264
Common stock issued, net of shares withheld for employee taxes, Shares	29,296
Unrealized gain (loss) on investments, net of tax					(2)	(2)
Net loss					(352)	(352)
Balance at Sep. 30, 2019	$ 29	$ (12,714)	376,307	(1)	(330,325)	33,296
Balance, Shares at Sep. 30, 2019	2,955,253	(248,790)
Balance at Dec. 31, 2019	$ 29	$ (12,749)	376,306	(1)	(330,340)	33,245
Balance, Shares at Dec. 31, 2019	2,955,253	(253,082)
Stock-based compensation			13			13
Stock-based compensation, shares
Purchase of treasury stock, at cost		$ (1,868)				(1,868)
Purchase of treasury stock, at cost, Shares		(229,778)
Net loss					(498)	(498)
Balance at Jun. 30, 2020	$ 29	$ (14,617)	376,319	(1)	(330,838)	30,892
Balance, Shares at Jun. 30, 2020	2,955,253	(482,860)
Stock-based compensation			33			33
Stock-based compensation, shares	3,597
Purchase of treasury stock, at cost		$ (531)				(531)
Purchase of treasury stock, at cost, Shares		66,168
Net loss					(196)	(196)
Balance at Sep. 30, 2020	$ 29	$ (15,148)	$ 376,352	$ (1)	$ (331,034)	$ 30,198
Balance, Shares at Sep. 30, 2020	2,958,850	(549,028)