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Note 2 - Stock Issue (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2022 | Mar. 31, 2021
Stock Issued During Period, Shares, New Issues (in shares) | 1,400,889 | 13,914 | 54,613 | 11,979 | 64,803 |
Proceeds from Issuance of Common Stock |  |  |  |  | $ 28,342,019 | $ 1,544,448
Equity Offering [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 1,350,000 |  |  |  |  |
Proceeds from Issuance of Common Stock | $ 27,000,000 |  |  |  |  |

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