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Note 3 - Derivative Instruments - Gain or Losses of Derivative Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Fair value of natural gas derivatives, beginning of period     $ 0  
Purchases of natural gas derivatives $ 0 $ 0 359 $ 0
Change in unrealized gain (loss) on natural gas derivatives (1) [1] (13) 267 321 322
Fair value of natural gas derivatives, end of period [1] 236   236  
Realized gain (loss) from natural gas derivatives, net (2) [2] (80) (316) (444) (862)
Call Option [Member]        
Fair value of natural gas derivatives, beginning of period 329 81 0 572
Unrealized losses transferred to realized losses, net (80) (316) (444) (862)
Fair value of natural gas derivatives, end of period 236 32 236 32
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.