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Note 14 - Subsequent Events (Details Textual) - USD ($) |  | 1 Months Ended |
--- | --- | --- | ---
Nov. 17, 2020 | Oct. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Proceeds from Issuance or Sale of Equity, Total |  |  | $ 1,500,000 |
Advance from Investor, Current |  |  | $ 1,500,000 |
Subsequent Event [Member] |  |  |  |
Proceeds from Issuance or Sale of Equity, Total |  | $ 1,500,000 |  |
Proceeds from Advances on Proposed Equity Financing |  | $ 1,500,000 |  |
Subsequent Event [Member] | Series B Preferred Stock [Member] |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 170,000 |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) | 10 |  |  |
Preferred Stock, Dividend Rate, Percentage | 8.00% |  |  |
Preferred Stock, Dividend Rate, Per-Dollar-Amount (in dollars per share) | $ 10 |  |  |

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