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STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Statement [Abstract]      
Revenue $ 81,329,858 $ 100,202,557 $ 39,687,010
Cost of sales 77,010,940 83,600,854 69,411,709
Gross profit (loss) 4,318,918 16,601,703 (29,724,699)
Selling, general and administrative expenses 8,614,190 7,636,148 7,308,220
Income (loss) from operations (4,295,272) 8,965,555 (37,032,919)
Other income (expense):      
Interest/other income (expense) (22,659) (40,433) 145,072
Interest expense (1,356,645) (918,129) (794,428)
Total other expense, net (1,379,304) (958,562) (649,356)
Income (loss) before provision for (benefit from) income taxes (5,674,576) 8,006,993 (37,682,275)
Provision for (benefit from) income taxes (2,066,000) 2,991,000 (12,473,000)
Net income (loss) (3,608,576) 5,015,993 (25,209,275)
Other comprehensive income (loss), net of tax      
Change in unrealized loss; interest rate swap (5,547) 6,263 11,399
Comprehensive income (loss) $ (3,614,123) $ 5,022,256 $ (25,197,876)
Income (loss) per common share - basic (in dollars per share) $ 0.42 $ 0.59 $ (2.98)
Income (loss) per common share - diluted (in dollars per share) $ 0.42 $ 0.58 $ (2.98)
Shares used in computing income (loss) per common share:      
Basic (shares) 8,655,848 8,552,817 8,465,937
Diluted (shares) 8,655,848 8,579,986 8,465,937