Annual report pursuant to Section 13 and 15(d)

Note 10 - Derivatives and Fair Value - Gain Loss on Derivative Instruments (Details)

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Note 10 - Derivatives and Fair Value - Gain Loss on Derivative Instruments (Details) - Crude Oil Swaps [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Derivative instruments loss, net $ (37,812) $ (22,826) $ 6,577
Cash Settlements Paid on Matured Derivative Contracts, Net [Member]      
Derivative instruments loss, net (42,935) (18,020) 7,216
Unrealized Gain (Loss) [Member]      
Derivative instruments loss, net $ 5,123 $ (4,806) $ (639)