Quarterly report pursuant to Section 13 or 15(d)

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

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Note 8 - Derivatives and Fair Value - Gain Loss on Derivative Instruments (Details) - Crude Oil Swaps [Member] - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Derivative instruments loss, net $ 31 $ (9,542) $ 52 $ (41,300)
Cash Settlements Paid on Matured Derivative Contracts, Net [Member]        
Derivative instruments loss, net (4) (21,059) (63) (33,559)
Unrealized Gain (Loss) [Member]        
Derivative instruments loss, net $ 35 $ 11,517 $ 115 $ (7,741)