Condensed Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenue	$ 21,944,320	$ (23,751,623)	$ 41,820,886	$ (1,868,106)
Cost of sales	18,095,951	19,211,531	34,370,446	36,603,916
Gross profit (loss)	3,848,369	(42,963,154)	7,450,440	(38,472,022)
Selling, general and administrative expenses	2,049,793	1,785,044	4,069,159	3,623,704
Income (loss) from operations	1,798,576	(44,748,198)	3,381,281	(42,095,726)
Interest expense	270,468	158,753	485,053	302,356
Income (loss) before provision for (benefit from) income taxes	1,528,108	(44,906,951)	2,896,228	(42,398,082)
Provision for (benefit from) income taxes	538,000	(15,215,000)	978,000	(14,435,000)
Net income (loss)	990,108	(29,691,951)	1,918,228	(27,963,082)
interest rate swap	1,637	1,453	2,644	4,632
Comprehensive income (loss)	$ 991,745	$ (29,690,498)	$ 1,920,872	$ (27,958,450)
Income (loss) per common share – basic (in dollars per share)	$ 0.12	$ (3.50)	$ 0.22	$ (3.31)
Income (loss) per common share – diluted (in dollars per share)	$ 0.12	$ (3.50)	$ 0.22	$ (3.31)
Shares used in computing income (loss) per common share:
Basic (in shares)	8,551,578	8,472,151	8,534,395	8,446,787
Diluted (in shares)	8,609,693	8,472,151	8,595,848	8,446,787