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Note 9 - Convertible Notes (Details Textual) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 16, 2023 shares | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2023 USD ($) $ / shares | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) $ / shares shares | Sep. 30, 2022 USD ($) | Jun. 30, 2023 $ / shares
Liabilities, Fair Value Adjustment |  |  |  |  |  | $ (5,424,251) | $ 1,769,000 |
Conversion of Debt into Common Stock [Member] |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued | shares | 795,905 |  |  |  |  | 795,905 |  |
Debt Conversion, Converted Instrument, Warrants or Options Issued | shares | 101,367 |  |  |  |  | 101,367 |  |
Prefunded Warrant [Member] |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  | $ 0.001 |  | $ 0.001 |  | $ 0.001
Convertible Debt [Member] |  |  |  |  |  |  |  |
Liabilities, Fair Value Adjustment |  |  |  | $ 4,800,000 | $ 0 | $ 5,400,000 | $ (1,800,000) |
Debt Instrument, Convertible, Conversion Price | $ / shares |  |  |  |  |  |  |  | $ 1.47
Debt Instrument, Convertible, Discount |  |  |  |  |  |  |  | 30.00%
Debt Instrument, Convertible, Maximum Beneficial Ownership |  |  |  |  |  |  |  | 9.99%
Payments of Debt Issuance Costs |  |  |  |  |  | 50,000 |  |
Debt Instrument, Convertible, Number of Equity Instruments | 897,272 |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature |  |  |  |  |  | $ 7,000,000.0 |  |
The 2020 Notes [Member] |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-Term Debt |  |  | $ 5,100,000 |  |  |  |  |
The 2021 Notes [Member] |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-Term Debt |  | $ 6,000,000.0 |  |  |  |  |  |

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