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BALANCE SHEETS (Parenthetical) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Common Stock, no par value (in dollars per share) | $ 0.00 | $ 0.00
Common Stock, authorized shares | 100,000,000 | 100,000,000
Common Stock, outstanding shares | 27,252,463 | 25,318,700
Accounts receivable, allowance for doubtful accounts (in dollars) | $ 2,186,190 | $ 2,078,944
Preferred Stock, par value (in dollars per share) | $ 1 | $ 1
Common stock in treasury - at cost; outstanding | 67,102 | 0
Class B |  |
Preferred Stock, authorized shares | 5,000,000 | 5,000,000
Preferred Stock, par value (in dollars per share) | $ 1.00 | $ 1.00
Series I, Class B |  |
Preferred Stock, outstanding shares | 103,500 | 103,500
Preferred Stock, liquidation preference (in dollars) | 646,875 | 646,875
Preferred Stock, par value (in dollars per share) | $ 1 | $ 1
Series II, Class B |  |
Preferred Stock, outstanding shares | 178,700 | 178,700
Preferred Stock, liquidation preference (in dollars) | 2,233,750 | 2,233,750
Preferred Stock, par value (in dollars per share) | $ 1 | $ 1
Series III, Class B |  |
Preferred Stock, outstanding shares | 130,245 | 130,245
Preferred Stock, liquidation preference (in dollars) | 1,628,063 | 1,628,063
Preferred Stock, par value (in dollars per share) | $ 1 | $ 1
Series IV, Class B |  |
Preferred Stock, outstanding shares | 542,500 | 542,500
Preferred Stock, liquidation preference (in dollars) | 5,967,500 | 5,967,500
Preferred Stock, par value (in dollars per share) | $ 1 | $ 1
Series V, Class B |  |
Preferred Stock, outstanding shares | 46,607 | 46,607
Preferred Stock, liquidation preference (in dollars) | $ 205,071 | $ 205,071
Preferred Stock, par value (in dollars per share) | $ 1 | $ 1

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