Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Treasury Stock	Additional Paid-In Capital	Other Comprehensive Income / Loss	Retained Earnings / Accumulated Deficit	Total
Balance at Dec. 31, 2017	$ 29	$ (12,148)	$ 375,611	$ (3)	$ (330,156)	$ 33,333
Balance, Shares at Dec. 31, 2017	2,910,334	(177,484)
Stock-based compensation			21			21
Restricted stock issued			53			53
Restricted stock issued, Shares	6,592
Common stock issued, net of shares withheld for employee taxes			89			89
Common stock issued, net of shares withheld for employee taxes, Shares	249
Net income (loss)					(40)	(40)
Balance at Mar. 31, 2018	$ 29	$ (12,148)	375,774	(3)	(330,196)	33,456
Balance, Shares at Mar. 31, 2018	2,917,175	(177,484)
Stock-based compensation			18			18
Common stock issued, net of shares withheld for employee taxes			111			111
Common stock issued, net of shares withheld for employee taxes, Shares	1,218
Net income (loss)				1	150	151
Balance at Jun. 30, 2018	$ 29	$ (12,148)	375,903	(2)	(330,046)	33,736
Balance, Shares at Jun. 30, 2018	2,918,393	(177,484)
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			11			11
Common stock issued, net of shares withheld for employee taxes, Shares	1,946
Purchase of common stock, at cost		$ (31)				(31)
Purchase of treasury stock, at cost, Shares		(3,999)
Unrealized gain on investments, net of tax				(19)		(19)
Net income (loss)					56	56
Balance at Mar. 31, 2019	$ 29	$ (12,244)	375,990	(21)	(329,137)	34,617
Balance, Shares at Mar. 31, 2019	2,921,488	(189,940)
Stock-based compensation			9			9
Common stock issued, net of shares withheld for employee taxes			36			36
Common stock issued, net of shares withheld for employee taxes, Shares	4,469
Purchase of common stock, at cost		$ (470)				(470)
Purchase of treasury stock, at cost, Shares		(58,850)
Unrealized gain on investments, net of tax				22		22
Net income (loss)					(836)	(836)
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)