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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, 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        
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, net $ 26 79,974     80,000
Common stock issued upon exercise of options, net (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        
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, net $ 3 (3)      
Common stock issued upon exercise of options, net (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
Net income (loss)     5,767,634   $ 5,767,634
Change in unrealized (gain) loss from interest rate swap       (5,800) (5,800)
Common stock issued upon exercise of options, net $ 3 (3)      
Common stock issued upon exercise of options, net (in shares) 3,334        
Common stock issued as employee compensation $ 6 50,776     50,782
Common stock issued as employee compensation (in shares) 5,550        
Stock based compensation expense $ 116 894,895     895,011
Stock based compensation expense (in shares) 115,599        
Balance, ending at Dec. 31, 2017 $ 8,863 $ 53,770,618 $ 20,548,652 $ (14,800) $ 74,313,333
Balance, ending (in shares) at Dec. 31, 2017 8,864,319       8,864,319