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Note 5 - Derivative Instruments - Carrying Value of Derivative Instruments (Details) - Future [Member]
Pure in Thousands, $ in Thousands
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Regulated fixed price future commitments, included in other current assets (in thousand barrels) 250 142
Regulated fixed price future commitments, included in other current assets (in thousand barrels) $ 1,051 $ (485)