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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

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