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Note 9 - Financial Instruments - Effect of Derivative Instruments on Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
9 Months Ended 21 Months Ended
Sep. 30, 2024
Sep. 30, 2024
Natural gas commodity contracts $ 0 $ 414
Natural Gas Commodity Contracts [Member] | Not Designated as Hedging Instrument [Member]    
Natural gas commodity contracts 0 235
Crude Oil Commodity Contracts [Member] | Not Designated as Hedging Instrument [Member]    
Natural gas commodity contracts $ 0 $ 179