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Note 1 - Description of Business and Basis of Presentation (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2022 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($)
Unrealized Gain (Loss) on Derivatives |  | $ 1,791 | $ (0) |  |
Retained Earnings (Accumulated Deficit), Total | $ 123,058 | 123,058 |  |  | $ 163,836
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |
Retained Earnings (Accumulated Deficit), Total | $ (100) | $ (100) |  |  |
Put Option [Member] |  |  |  |  |
Open Option Contracts Written, Number of Shares | 207,970 | 207,970 |  | 207,970 |
Open Option Contracts, Expiration Period (Month) |  |  |  | 24 months |
Open Option Contracts Written, at Fair Value | $ 1,800 | $ 1,800 |  | $ 3,600 |
Unrealized Gain (Loss) on Derivatives | $ 1,800 | $ 1,800 |  |  |

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