Consolidated Statements of Shareholders' Deficit - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance at Dec. 31, 2017	$ 971	$ 744,937	$ (815,184)	$ 11,394	$ (57,882)
Issuances and cancellations of nonvested stock	20	(20)
Compensation recognized under stock compensation plans		187			187
Net income (loss)			(6,134)		(6,134)
Other comprehensive income (loss)				(11,395)	(11,395)
Net income			6,134		6,134
Balance at Dec. 31, 2018	991	745,104	(809,050)	(1)	(62,956)
Issuances and cancellations of nonvested stock	42	(42)
Common stock granted in debt restructure	90	(90)
Common stock and common stock warrants granted in debt restructure		916			916
Compensation recognized under stock compensation plans		224			224
Net income (loss)			10,225		10,225
Adjustment to retained earnings for adoption of accounting standard			(19)		(19)
Other comprehensive income (loss)				1	1
Net income			(10,225)		(10,225)
Balance at Dec. 31, 2019	$ 1,123	$ 746,112	$ (819,294)		$ (72,059)