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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
Accumulated Deficit
Treasury Stock
Total
Balance at Dec. 31, 2013 $ 103,500 $ 178,700 $ 130,245 $ 542,500 $ 40,000   $ 58,983,166 $ (30,228,293) $ (1,096,609) $ 28,653,209
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        
Stock options exercised             398,328     398,328
Stock options exercised (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 (32,582,898) (1,096,609) 26,581,707
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        
Stock options exercised             283,933     283,933
Stock options exercised (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 (28,268,580)   30,780,901
Balance (in shares) at Dec. 31, 2015 98,500 171,200 129,245 342,500 40,000 28,619,874        
Increase (Decrease) in Stockholders' Equity                    
Stock options exercised             855,021     855,021
Stock options exercised (in shares)           1,046,580        
Dividends             (220,450)     (220,450)
Stock option compensation             387,726     387,726
Net income (loss)               (3,694,907)   (3,694,907)
Balance at Dec. 31, 2016 $ 98,500 $ 171,200 $ 129,245 $ 342,500 $ 40,000   $ 59,290,333 $ (31,963,487)   $ 28,108,291
Balance (in shares) at Dec. 31, 2016 98,500 171,200 129,245 342,500 40,000 29,666,454