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Note 8 - Convertible Notes (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Changes in fair value of convertible debt |  |  |  |  | $ (0) | $ 646,000
Convertible Debt [Member] |  |  |  |  |  |
Changes in fair value of convertible debt |  |  | $ 600,000 | $ 200,000 |  |
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 |  |  |  |  |

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