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BALANCE SHEETS (Parenthetical) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
BALANCE SHEETS    
Accounts receivable, allowance for doubtful accounts (in dollars) $ 1,795,481 $ 1,725,806
Common stock, par value (in dollars per share) $ 0 $ 0
Common Stock, authorized shares 100,000,000 100,000,000
Common Stock, outstanding shares 28,619,874 27,613,397
Common stock in treasury - at cost; outstanding 0 722,920
Class B    
Preferred stock, par value (in dollars per share) $ 1 $ 1
Preferred Stock, authorized shares 5,000,000 5,000,000
Series I, Class B    
Preferred stock, par value (in dollars per share) $ 1 $ 1
Preferred Stock, outstanding shares 98,500 98,500
Preferred Stock, liquidation preference (in dollars) $ 615,625 $ 615,625
Series II, Class B    
Preferred stock, par value (in dollars per share) $ 1 $ 1
Preferred Stock, outstanding shares 171,200 176,200
Preferred Stock, liquidation preference (in dollars) $ 2,140,000 $ 2,202,500
Series III, Class B    
Preferred stock, par value (in dollars per share) $ 1 $ 1
Preferred Stock, outstanding shares 129,245 130,245
Preferred Stock, liquidation preference (in dollars) $ 1,615,563 $ 1,628,063
Series IV, Class B    
Preferred stock, par value (in dollars per share) $ 1 $ 1
Preferred Stock, outstanding shares 342,500 542,500
Preferred Stock, liquidation preference (in dollars) $ 3,767,500 $ 5,967,500
Series V, Class B    
Preferred stock, par value (in dollars per share) $ 1 $ 1
Preferred Stock, outstanding shares 40,000 40,000
Preferred Stock, liquidation preference (in dollars) $ 176,000 $ 176,000