Annual report pursuant to Section 13 and 15(d)

Note 9 - Derivative Financial Instruments - Cash Receipts on Commodity Derivative Contract Settlements (Details)

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Note 9 - Derivative Financial Instruments - Cash Receipts on Commodity Derivative Contract Settlements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivatives cash receipts (payments), net $ 45,196 $ 13,941 $ (28,164)