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Note 19 - Subsequent Events (Details Textual) - USD ($) | 1 Months Ended | 9 Months Ended
--- | --- | ---
Nov. 12, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Proceeds from Issuance of Common Stock |  | $ 58,625,000 | $ 59,549,751
Subsequent Event [Member] |  |  |
Proceeds from Sale of Equity Securities, FV-NI | $ 17,100,000 |  |
Subsequent Event [Member] | Common Class A [Member] |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 73,397 |  |
Proceeds from Issuance of Common Stock | $ 2,700,000 |  |

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