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Statements of Operations and Comprehensive Income (Loss) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenue $ 100,202,557 $ 39,687,010 $ 82,988,522
Cost of sales 83,600,854 69,411,709 64,555,275
Gross profit (loss) 16,601,703 (29,724,699) 18,433,247
Selling, general and administrative expenses 7,636,148 7,308,220 6,704,524
Income (loss) from operations 8,965,555 (37,032,919) 11,728,723
Other income (expense):      
Interest/other income (expense) (40,433) 145,072 78,957
Interest expense (918,129) (794,428) (653,786)
Total other expense, net (958,562) (649,356) (574,829)
Income (loss) before provision for (benefit from) income taxes 8,006,993 (37,682,275) 11,153,894
Provision for (benefit from) income taxes 2,991,000 (12,473,000) 3,417,000
Net income (loss) 5,015,993 (25,209,275) 7,736,894
Other comprehensive income (loss), net of tax      
Change in unrealized gain (loss)- Interest rate swap 6,263 11,399 19,712
Comprehensive income (loss) $ 5,022,256 $ (25,197,876) $ 7,756,606
Income (loss) per common share-basic (in dollars per share) $ 0.59 $ (2.98) $ 0.92
Income (loss) per common share-diluted (in dollars per share) $ 0.58 $ (2.98) $ 0.91
Shares used in computing earnings per common share:      
Basic (in shares) 8,552,817 8,465,937 8,389,048
Diluted (in shares) 8,579,986 8,465,937 8,470,578