Quarterly report pursuant to Section 13 or 15(d)

Note 8 - Derivatives and Fair Value - Loss on Derivative Instruments (Details)

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Note 8 - Derivatives and Fair Value - Loss on Derivative Instruments (Details) - Crude Oil Swaps [Member] - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Derivative instruments loss, net $ (9,542) $ (9,969) $ (41,300) $ (15,923)
Cash Settlements Paid on Matured Derivative Contracts, Net [Member]        
Derivative instruments loss, net (21,059) (4,293) (33,559) (6,003)
Cash Settlements Not Paid on Matured Derivative Contracts, Net [Member]        
Derivative instruments loss, net $ 11,517 $ (5,676) $ (7,741) $ (9,920)