CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (Unaudited) [Abstract]
Revenue	$ (23,751,623)	$ 21,110,452	$ (1,868,106)	$ 41,037,885
Cost of sales	19,211,531	16,874,205	36,603,916	32,361,068
Gross profit (loss)	(42,963,154)	4,236,247	(38,472,022)	8,676,817
Selling, general and administrative expenses	1,785,045	1,496,272	3,623,704	3,374,195
Income (loss) from operations	(44,748,199)	2,739,975	(42,095,726)	5,302,622
Interest expense	158,752	155,699	302,356	297,071
Income (loss) before provision for (benefit from) income taxes	(44,906,951)	2,584,276	(42,398,082)	5,005,551
Provision for (benefit from) income taxes	(15,215,000)	800,000	(14,435,000)	1,550,000
Net income (loss)	(29,691,951)	1,784,276	(27,963,082)	3,455,551
Other comprehensive income (loss), net of tax -
Change in unrealized gain (loss) - interest rate swap	1,453	13,679	4,632	17,390
Comprehensive income (loss)	$ (29,690,498)	$ 1,797,955	$ (27,958,450)	$ 3,472,941
Income (loss) per common share - basic (in dollars per share)	$ (3.50)	$ 0.21	$ (3.31)	$ 0.41
Income (loss) per common share - diluted (in dollars per share)	$ (3.50)	$ 0.21	$ (3.31)	$ 0.41
Shares used in computing income (loss) per common share:
Basic (in shares)	8,472,151	8,391,954	8,446,787	8,384,844
Diluted (in shares)	8,472,151	8,456,156	8,446,787	8,452,064