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, 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
Balance at Dec. 31, 2019	464	548,304	(530,389)	(5,168)	13,211
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	(1,418)	0	(1,418)
Balance at Mar. 31, 2020	464	548,304	(531,807)	(5,168)	11,793
Balance at Dec. 31, 2019	464	548,304	(530,389)	(5,168)	13,211
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)					(2,382)
Balance at Jun. 30, 2020	464	548,304	(532,771)	(5,168)	10,829
Balance at Mar. 31, 2020	464	548,304	(531,807)	(5,168)	11,793
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	(964)	0	(964)
Balance at Jun. 30, 2020	$ 464	$ 548,304	$ (532,771)	$ (5,168)	$ 10,829