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Note 1 - Description of Business, Basis of Presentation and Summary of Accounting Policies (Details Textual) - Options Held [Member] - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Jun. 30, 2022
Derivative, Underlying Investment, Shares (in shares) | 132,924 | 207,970
Derivative, Underlying Investment, Fair Value | $ 1.8 | $ 3.6
Open Option Contracts, Expiration Period (Month) | 24 months |
Increase (Decrease) in Derivative Liabilities | $ (2.4) |

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