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CONDENSED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($)
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Total
Balance, beginning at Dec. 31, 2014 $ 8,501 $ 51,440,770 $ 13,373,601 $ (9,716) $ 64,813,156
Balance, beginning (in shares) at Dec. 31, 2014 8,500,555        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
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 $ 26 79,974     80,000
Common stock issued upon exercise of options (in shares) 25,352        
Tax benefit of stock option exercise   33,000     33,000
Stock-based compensation expense $ 25 415,010     415,035
Stock-based compensation expense (in shares) 25,671        
Balance, ending at Jun. 30, 2015 $ 8,552 51,968,754 15,291,829 (7,072) 67,262,063
Balance, ending (in shares) at Jun. 30, 2015 8,551,578        
Balance, beginning at Dec. 31, 2015 $ 8,584 52,137,384 18,389,594 (3,453) $ 70,532,109
Balance, beginning (in shares) at Dec. 31, 2015 8,583,511       8,583,511
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income (loss)         $ (7,429,640)
Loss on settlement and reclassification into earnings       3,453 3,453
Change in unrealized loss from interest rate swap       (73,936) (73,936)
Stock-based compensation expense         415,050
Balance, ending at Jun. 30, 2016 $ 8,609 $ 52,552,409 $ 10,959,954 $ (73,936) $ 63,447,036
Balance, ending (in shares) at Jun. 30, 2016 8,610,453       8,610,453