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Note 3 - Derivative Instruments - Gain or Losses of Derivative Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Fair value of natural gas derivatives, beginning of period |  |  |  | $ 0 |
Purchases of natural gas derivatives |  | $ 359 | $ 0 | 359 | $ 0
Change in unrealized gain (loss) on natural gas derivatives (1) | [1] | 82 | 224 | 334 | 55
Fair value of natural gas derivatives, end of period | [1] | 329 |  | 329 |
Realized gain (loss) from natural gas derivatives, net (2) | [2] | (112) | (294) | (364) | (546)
Call Option [Member] |  |  |  |  |
Fair value of natural gas derivatives, beginning of period |  | 0 | 151 | 0 | 572
Unrealized losses transferred to realized losses, net |  | (112) | (294) | (364) | (546)
Fair value of natural gas derivatives, end of period |  | 329 | 81 | 329 | 81
Derivative settlement payments received (2) | [2] | $ 0 | $ 0 | $ 0 | $ 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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