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Note 1 - Description of Business and Basis of Presentation (Details Textual) - Options Held [Member] - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2022
Derivative, Underlying Investment, Shares (in shares) |  |  | 207,970
Derivative, Underlying Investment, Fair Value |  | $ 1.8 | $ 3.6
Open Option Contracts, Expiration Period (Month) |  |  | 24 months
Derivative, Underlying Investment, Shares, Expirations in Period (in shares) | 132,924 |  |
Increase (Decrease) in Derivative Liabilities | $ 2.4 |  |

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