Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2017	$ 464	$ 548,304	$ (525,798)	$ (5,168)	$ 17,802
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	1,804	0	1,804
Balance at Mar. 31, 2018	464	548,304	(523,994)	(5,168)	19,606
Balance at Dec. 31, 2017	464	548,304	(525,798)	(5,168)	17,802
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)					603
Balance at Jun. 30, 2018	464	548,304	(525,195)	(5,168)	18,405
Balance at Mar. 31, 2018	464	548,304	(523,994)	(5,168)	19,606
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	(1,201)	0	(1,201)
Balance at Jun. 30, 2018	464	548,304	(525,195)	(5,168)	18,405
Balance at Dec. 31, 2018	464	548,304	(525,463)	(5,168)	18,137
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	(858)	0	(858)
Balance at Mar. 31, 2019	464	548,304	(526,321)	(5,168)	17,279
Balance at Dec. 31, 2018	464	548,304	(525,463)	(5,168)	18,137
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)					(3,007)
Balance at Jun. 30, 2019	464	548,304	(528,470)	(5,168)	15,130
Balance at Mar. 31, 2019	464	548,304	(526,321)	(5,168)	17,279
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	(2,149)	0	(2,149)
Balance at Jun. 30, 2019	$ 464	$ 548,304	$ (528,470)	$ (5,168)	$ 15,130