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STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
Preferred Stock
Series I, Class B
Preferred Stock
Series II, Class B
Preferred Stock
Series III, Class B
Preferred Stock
Series IV, Class B
Preferred Stock
Series V, Class B
Common Stock
Additional Paid-in Capital
Retained Earnings
Treasury Stock
Total
Balance at Dec. 31, 2012 $ 103,500 $ 178,700 $ 130,245 $ 542,500 $ 46,607   $ 58,617,308 $ (23,767,662) $ (122,202) $ 35,728,996
Balance (in shares) at Dec. 31, 2012 103,500 178,700 130,245 542,500 46,607 27,252,463        
Increase (Decrease) in Stockholders' Equity                    
Conversion of Preferred Stock into Common Stock         $ (6,607)   6,607      
Conversion of Preferred Stock into Common Stock (in shares)         (6,607) 6,607        
Recognition of stock option compensation             52,775     52,775
Recognition of stock option exercise             536,925     536,925
Recognition of stock option exercise (in shares)           584,450        
Dividends             (230,449)     (230,449)
Repurchase of Common Stock                 (974,407) (974,407)
Repurchase of Common Stock (in shares)           (655,818)        
Net income (loss)               (6,213,852)   (6,213,852)
Balance at Dec. 31, 2013 $ 103,500 $ 178,700 $ 130,245 $ 542,500 $ 40,000   58,983,166 (29,981,514) (1,096,609) 28,899,988
Balance (in shares) at Dec. 31, 2013 103,500 178,700 130,245 542,500 40,000 27,187,702        
Increase (Decrease) in Stockholders' Equity                    
Conversion of Preferred Stock into Common Stock $ (5,000) $ (2,500)         7,500      
Conversion of Preferred Stock into Common Stock (in shares) (5,000) (2,500)       7,500        
Recognition of stock option compensation             398,328     398,328
Recognition of stock option exercise (in shares)           418,195        
Dividends             (115,225)     (115,225)
Net income (loss)               (2,354,605)   (2,354,605)
Balance at Dec. 31, 2014 $ 98,500 $ 176,200 $ 130,245 $ 542,500 $ 40,000   59,273,769 (32,336,119) (1,096,609) 26,828,486
Balance (in shares) at Dec. 31, 2014 98,500 176,200 130,245 542,500 40,000 27,613,397        
Increase (Decrease) in Stockholders' Equity                    
Conversion of Preferred Stock into Common Stock   $ (5,000) $ (1,000) $ (200,000)     206,000      
Conversion of Preferred Stock into Common Stock (in shares)   (5,000) (1,000) (200,000)   206,000        
Recognition of stock option exercise             283,933     283,933
Recognition of stock option exercise (in shares)           272,477        
Issuance of new Common stock (in shares)           528,000        
Registration of new shares             (60,101)     (60,101)
Retirement of treasury stock             (1,096,609)   $ 1,096,609  
Dividends             (338,956)     (338,956)
Net income (loss)               4,314,318   4,314,318
Balance at Dec. 31, 2015 $ 98,500 $ 171,200 $ 129,245 $ 342,500 $ 40,000   $ 58,268,036 $ (28,021,801)   $ 31,027,680
Balance (in shares) at Dec. 31, 2015 98,500 171,200 129,245 342,500 40,000 28,619,874