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Note 3 - Derivative Instruments - Location and Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Fair value of derivative |  | $ 329 | [1] |  | $ 0 |  |  |
Call Option [Member] |  |  |  |  |  |  |  |
Fair value of derivative |  | 329 |  | $ 0 | 0 | $ 81 | $ 151 | $ 572
Call Option [Member] | Prepaid Expenses and Other Current Assets [Member] |  |  |  |  |  |  |  |
Fair value of derivative | [2] | 329 | [1] |  | 0 |  |  |
Call Option [Member] | Operating Lease Right of Use Asset and Other Assets Noncurrent [Member] |  |  |  |  |  |  |  |
Fair value of derivative | [2] | $ 0 | [1] |  | $ 0 |  |  |
[1] | Amounts are presented on a gross basis.
[2] | The classification between current and noncurrent assets is based upon when the Call Options mature.

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