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Note 1 - Description of Business and Basis of Presentation (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Jun. 30, 2022
Unrealized Gain (Loss) on Derivatives |  |  | $ (653) | $ 145 |  |
Options Held [Member] |  |  |  |  |  |
Derivative, Underlying Investment, Shares (in shares) |  |  |  |  |  | 207,970
Derivative, Underlying Investment, Fair Value |  |  |  |  | $ 1,800 | $ 3,600
Open Option Contracts, Expiration Period (Month) |  |  |  |  |  | 24 months
Derivative, Underlying Investment, Shares, Expirations in Period (in shares) |  |  | 132,924 |  |  |
Increase (Decrease) in Derivative Liabilities |  |  | $ 2,400 |  |  |
Unrealized Gain (Loss) on Derivatives | $ (300) | $ 300 | $ 700 | $ 100 |  |

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