CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data	Total	Common Shares [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]
Beginning Balance at Dec. 31, 2011	$ 84,973	$ 99,746	$ 5,334	$ (24,914)	$ 4,807
Beginning Balance, Shares at Dec. 31, 2011		16,331,241
Shares issued upon exercise of employee stock options	151	208	(57)
Shares issued upon exercise of employee stock options, Shares		68,000
Net income (loss)	(9,979)			(9,979)
Other comprehensive loss	(47)				(47)
Share-based compensation	227		227
Ending Balance at Jun. 30, 2012	75,325	99,954	5,504	(34,893)	4,760
Ending Balance, Shares at Jun. 30, 2012		16,399,241
Beginning Balance at Dec. 31, 2012	49,657	99,954	5,708	(60,889)	4,884
Beginning Balance, Shares at Dec. 31, 2012		16,399,241
Shares issued upon exercise of employee stock options	170	250	(80)
Shares issued upon exercise of employee stock options, Shares		33,000
Net income (loss)	50,699			50,699
Other comprehensive loss	(72)				(72)
Share-based compensation	187		187
Ending Balance at Jun. 30, 2013	$ 100,641	$ 100,204	$ 5,815	$ (10,190)	$ 4,812
Ending Balance, Shares at Jun. 30, 2013		16,432,241