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STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Loss [Member] | Total
--- | --- | --- | --- | --- | ---
Balance, beginning at Dec. 31, 2013 | $ 8,410 | $ 50,381,348 | $ 38,582,876 | $ (21,115) | $ 88,951,519
Balance, beginning (in shares) at Dec. 31, 2013 | 8,410,493 |  |  |  |
Net income (loss) |  |  | (25,209,275) |  | (25,209,275)
Change in unrealized (gain) loss from interest rate swap |  |  |  | 11,399 | 11,399
Common stock issued upon exercise of options | $ 86 | 447,665 |  |  | 447,751
Common stock issued upon exercise of options (in shares) | 85,312 |  |  |  |
Common stock issued as employee compensation | $ 5 | 57,992 |  |  | 57,997
Common stock issued as employee compensation (in shares) | 4,750 |  |  |  |
Tax benefit of stock option exercise |  | 86,000 |  |  | 86,000
Stock-based compensation expense |  | 467,765 |  |  | 467,765
Balance, ending at Dec. 31, 2014 | $ 8,501 | 51,440,770 | 13,373,601 | (9,716) | 64,813,156
Balance, ending (in shares) at Dec. 31, 2014 | 8,500,555 |  |  |  |
Net income (loss) |  |  | 5,015,993 |  | 5,015,993
Change in unrealized (gain) loss from interest rate swap |  |  |  | 6,263 | 6,263
Common stock issued upon exercise of options | $ 26 | 79,974 |  |  | 80,000
Common stock issued upon exercise of options (in shares) | 25,352 |  |  |  |
Common stock issued as employee compensation | $ 6 | 59,417 |  |  | 59,423
Common stock issued as employee compensation (in shares) | 6,255 |  |  |  |
Stock-based compensation expense | $ 51 | 524,223 |  |  | 524,274
Stock-based compensation expense (in shares) | 51,349 |  |  |  |
Tax benefit of stock option exercise |  | 33,000 |  |  | 33,000
Balance, ending at Dec. 31, 2015 | $ 8,584 | 52,137,384 | 18,389,594 | (3,453) | $ 70,532,109
Balance, ending (in shares) at Dec. 31, 2015 | 8,583,511 |  |  |  | 8,583,511
Net income (loss) |  |  | (3,608,576) |  | $ (3,608,576)
Change in unrealized (gain) loss from interest rate swap |  |  |  | (5,547) | (5,547)
Common stock issued upon exercise of options | $ 3 | (3) |  |  |
Common stock issued upon exercise of options (in shares) | 3,448 |  |  |  |
Common stock issued as employee compensation | $ 97 | 163,354 |  |  | 163,451
Common stock issued as employee compensation (in shares) | 98,645 |  |  |  |
Stock-based compensation expense | $ 54 | 524,215 |  |  | 524,269
Stock-based compensation expense (in shares) | 54,232 |  |  |  |
Balance, ending at Dec. 31, 2016 | $ 8,738 | $ 52,824,950 | $ 14,781,018 | $ (9,000) | $ 67,605,706
Balance, ending (in shares) at Dec. 31, 2016 | 8,739,836 |  |  |  | 8,739,836

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