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BALANCE SHEETS (Parenthetical) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts receivable, allowance for doubtful accounts (in dollars) | $ 149,665 | $ 101,872
Common stock, par value (in dollars per share) | $ 0 | $ 0
Common Stock, authorized shares | 100,000,000 | 100,000,000
Common Stock, outstanding shares | 32,666,454 | 32,666,454
Preferred 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 | 171,200
Preferred Stock, liquidation preference (in dollars) | $ 2,140,000 | $ 2,140,000
Series III, Class B |  |
Preferred stock, par value (in dollars per share) | $ 1 | $ 1
Preferred Stock, outstanding shares | 129,245 | 129,245
Preferred Stock, liquidation preference (in dollars) | $ 1,615,563 | $ 1,615,563
Series IV, Class B |  |
Preferred stock, par value (in dollars per share) | $ 1 | $ 1
Preferred Stock, outstanding shares | 342,500 | 342,500
Preferred Stock, liquidation preference (in dollars) | $ 3,767,500 | $ 3,767,500
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

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