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Note 4 - Derivative Instruments - Gain or Losses of Derivative Instruments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Fair value of natural gas derivatives, beginning of period $ 572  
Purchases of natural gas derivatives 0 $ 2,241
Realized gains (losses), net (1,113) (791)
Change in unrealized gain (loss) on natural gas derivatives (1) [1] 541 (878)
Fair value of natural gas derivatives, end of year 0 572
Derivative settlement payments made 0 (1,037)
Total realized gain (loss) from natural gas derivatives, net (2) [2] (1,113) 413
Call Option [Member]    
Fair value of natural gas derivatives, beginning of period 572 0
Realized gains (losses), net (1,113) (791)
Fair value of natural gas derivatives, end of year 0 572
Derivative settlement payments received 0 1,235
Derivative settlement payments made $ 0 $ (31)
[1] Amounts are presented as their own separate line item within the Company's Consolidated Statements of Operations.
[2] Amounts are included within cost of revenues on the Company's Consolidated Statements of Operations.