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BALANCE SHEETS (Parenthetical) (USD $)
Dec. 31, 2013
Dec. 31, 2012
BALANCE SHEETS    
Accounts receivable, allowance for doubtful accounts (in dollars) $ 1,698,506 $ 2,186,190
Statement    
Common stock, no par value (in dollars per share) $ 0 $ 0
Common Stock, authorized shares 100,000,000 100,000,000
Common Stock, outstanding shares 27,187,702 27,252,463
Common stock in treasury - at cost; outstanding 722,920 67,102
Class B
    
Statement    
Preferred stock, par value (in dollars per share) $ 1.00 $ 1.00
Preferred Stock, authorized shares 5,000,000 5,000,000
Series I, Class B
    
Statement    
Preferred stock, par value (in dollars per share) $ 1 $ 1
Preferred Stock, outstanding shares 103,500 103,500
Preferred Stock, liquidation preference (in dollars) 646,875 646,875
Series II, Class B
    
Statement    
Preferred stock, par value (in dollars per share) $ 1 $ 1
Preferred Stock, outstanding shares 178,700 178,700
Preferred Stock, liquidation preference (in dollars) 2,233,750 2,233,750
Series III, Class B
    
Statement    
Preferred stock, par value (in dollars per share) $ 1 $ 1
Preferred Stock, outstanding shares 130,245 130,245
Preferred Stock, liquidation preference (in dollars) 1,628,063 1,628,063
Series IV, Class B
    
Statement    
Preferred stock, par value (in dollars per share) $ 1 $ 1
Preferred Stock, outstanding shares 542,500 542,500
Preferred Stock, liquidation preference (in dollars) 5,967,500 5,967,500
Series V, Class B
    
Statement    
Preferred stock, par value (in dollars per share) $ 1 $ 1
Preferred Stock, outstanding shares 40,000 46,607
Preferred Stock, liquidation preference (in dollars) $ 176,000 $ 205,071