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Statements of Shareholders' Equity - USD ($)
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
AOCI Attributable to Parent [Member]
Total
Balance (in shares) at Dec. 31, 2012 8,371,439          
Balance at Dec. 31, 2012 $ 8,371 $ 49,780,673 $ 30,845,982 $ (40,827) $ 80,594,199  
Net income (loss)     7,736,894     $ 7,736,894
Change in unrealized loss from interest rate swap         19,712  
Common stock issued upon exercise of options (in shares) 18,399         45,000
Common stock issued upon exercise of options $ 18 (18)        
Common stock issued as employee compensation (in shares) 20,655          
Common stock issued as employee compensation $ 21 193,884        
Stock based compensation expense   379,809        
Tax benefit from stock option plans   27,000     27,000  
Balance (in shares) at Dec. 31, 2013 8,410,493          
Balance at Dec. 31, 2013 $ 8,410 50,381,348 38,582,876 (21,115) 88,951,519  
Net Income     7,736,894     $ 7,736,894
Change in unrealized loss from interest rate swap         19,712  
Common stock issued upon exercise of options $ 18 (18)        
Stock based compensation expense   379,809        
Net income (loss)     (25,209,275)   (25,209,275) $ (25,209,275)
Change in unrealized loss from interest rate swap       11,399 11,399  
Common stock issued upon exercise of options (in shares) 85,312         155,000
Common stock issued upon exercise of options $ 86 447,665     447,751  
Common stock issued as employee compensation (in shares) 4,750          
Common stock issued as employee compensation $ 5 57,992     57,997  
Tax benefit from stock option plans   86,000     86,000  
Balance (in shares) at Dec. 31, 2014 8,500,555         8,583,511
Balance at Dec. 31, 2014 $ 8,501 51,440,770 13,373,601 (9,716) 64,813,156 $ 64,813,156
Stock based compensation expense   467,765     467,765  
Net Income     (25,209,275)   (25,209,275) (25,209,275)
Change in unrealized loss from interest rate swap       11,399 11,399  
Common stock issued upon exercise of options $ 86 447,665     447,751  
Net income (loss)     5,015,993   5,015,993 $ 5,015,993
Change in unrealized loss from interest rate swap       6,263 6,263  
Common stock issued upon exercise of options (in shares) 25,352         55,000
Common stock issued upon exercise of options $ 26 79,974     80,000  
Common stock issued as employee compensation (in shares) 6,255          
Common stock issued as employee compensation $ 6 59,417     59,423  
Stock based compensation expense $ 51 524,223     524,274  
Tax benefit from stock option plans   33,000     33,000  
Balance (in shares) at Dec. 31, 2015 8,583,511         8,583,511
Balance at Dec. 31, 2015 $ 8,584 52,137,384 18,389,594 (3,453) 70,532,109 $ 70,532,109
Net Income     $ 5,015,993   5,015,993 $ 5,015,993
Change in unrealized loss from interest rate swap       $ 6,263 6,263  
Common stock issued upon exercise of options $ 26 79,974     80,000  
Stock based compensation expense (in shares) 51,349          
Stock based compensation expense $ 51 $ 524,223     $ 524,274