Calculation of Net Earnings (Loss) and Weighted Average Common Shares and Common Equivalent Shares Outstanding for Computation of Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Net income (loss)	$ (13,450)	$ (8,564)	$ (5,182)	$ (5,445)	$ (1,833)	$ 3,752	$ 10,816	$ 24,176	$ (32,641)	$ 36,911	$ 69,557
Less: Income allocable to unvested restricted stock										(444)
Income (loss) available to common shareholders…………………………………...									(32,641)	36,467	69,557
Reallocation of participating earnings										2
Income (loss) attributable to common shareholders for diluted earnings per share									$ (32,641)	$ 36,469	$ 69,557
Weighted average number of common share equivalents:…………………..
Common shares used in basic earnings (loss) per share									12,996,958	12,950,958	12,886,372
Common share equivalents outstanding related to stock options										46,051	52,289
Total weighted average common shares and common share equivalents used in diluted earnings per share									12,996,958	12,997,009	12,938,661
Basic	$ (1.03)	$ (0.66)	$ (0.40)	$ (0.41)	$ (0.14)	$ 0.29	$ 0.83	$ 1.86	$ (2.51)	$ 2.82	$ 5.40
Diluted	$ (1.03)	$ (0.66)	$ (0.40)	$ (0.41)	$ (0.14)	$ 0.29	$ 0.82	$ 1.85	$ (2.51)	$ 2.81	$ 5.38