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Condensed Statements of Shareholders' Equity (Unaudited) - USD ($)
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Balance at January 1, 2014 (in shares) at Dec. 31, 2013 8,410,493        
Balance at January 1, 2014 at Dec. 31, 2013 $ 8,410 $ 50,381,348 $ 38,582,876 $ (21,115) $ 88,951,519
Net income (loss)     (27,963,082)   (27,963,082)
Change in unrealized loss from interest rate swap       4,632 4,632
Common stock issued upon exercise of options (in shares) 72,619        
Stock Issued During Period, Value, Stock Options Exercised $ 73 447,678     447,751
Tax benefit of stock option exercise   86,000     86,000
Stock-based compensation expense   205,618     205,618
Balance at June 30, 2014 (in shares) at Jun. 30, 2014 8,483,112        
Balance at June 30, 2014 at Jun. 30, 2014 $ 8,483 51,120,644 10,619,794 (16,483) 61,732,438
Net income     (27,963,082)   $ (27,963,082)
Balance at January 1, 2014 (in shares) at Dec. 31, 2014 8,500,555       8,500,555
Balance at January 1, 2014 at Dec. 31, 2014 $ 8,501 51,440,770 13,373,601 (9,716) $ 64,813,156
Net income (loss)     1,918,228   1,918,228
Change in unrealized loss from interest rate swap       2,644 $ 2,644
Common stock issued upon exercise of options (in shares) 25,352       55,000
Stock Issued During Period, Value, Stock Options Exercised $ 26 79,974     $ 80,000
Tax benefit of stock option exercise   33,000     $ 33,000
Balance at June 30, 2014 (in shares) at Jun. 30, 2015 8,551,578       8,551,578
Balance at June 30, 2014 at Jun. 30, 2015 $ 8,552 51,968,754 15,291,829 $ (7,072) $ 67,262,063
Net income     $ 1,918,228   1,918,228
Stock-based compensation expense (in shares) 25,671        
Stock-based compensation expense $ 25 $ 415,010     $ 415,035