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BALANCE SHEETS (Parenthetical) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts receivable, allowance for doubtful accounts (in dollars) | $ 205,822 | $ 146,832
Common stock, par value (in dollars per share) | $ 0 | $ 0
Common Stock, authorized shares | 100,000,000 | 100,000,000
Common Stock, outstanding shares | 33,957,204 | 32,674,954
Preferred Class B |  |
Preferred stock, par value (in dollars per share) | $ 1.00 |
Preferred Stock, Shares Authorized | 5,000,000 | 5,000,000
Series I, Class B |  |
Preferred stock, par value (in dollars per share) | $ 1 |
Preferred Stock, outstanding shares | 0 | 96,000
Series II, Class B |  |
Preferred stock, par value (in dollars per share) | $ 1 | $ 1
Preferred Stock, outstanding shares | 156,200 | 171,200
Preferred Stock, liquidation preference (in dollars) | $ 1,952,500 |
Series III Preferred Stock |  |
Preferred stock, par value (in dollars per share) | $ 1 | $ 1
Preferred Stock, outstanding shares | 106,745 | 129,245
Preferred Stock, liquidation preference (in dollars) | $ 1,334,313 |
Series IV Preferred Stock |  |
Preferred stock, par value (in dollars per share) | $ 1 | $ 1
Preferred Stock, outstanding shares | 0 | 342,500
Series V Preferred Stock |  |
Preferred stock, par value (in dollars per share) | $ 1 | $ 1
Preferred Stock, outstanding shares | 0 | 34,000

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