Note 5 - Derivative Financial Instruments - Price Risk Derivative Contracts (Details) - Not Designated as Hedging Instrument [Member]	6 Months Ended
	Jun. 30, 2023 $ / bbl MMBbls
Deferred Premium Put Options Q1 2024 [Member]
Volume (MBbls) (Million Barrels of Oil) | MMBbls	910.0
Price per Bbl (in USD per Barrel of Oil)	53.83
Price per Bbl (Net of Premium) (in USD per Barrel of Oil)	48.83
Crude Oil Derivative Swap Q3 2023 [Member]
Volume (MBbls) (Million Barrels of Oil) | MMBbls	276.0
Price per Bbl (in USD per Barrel of Oil)	72.30
Deferred Premium Put Options Q2 2024 [Member]
Volume (MBbls) (Million Barrels of Oil) | MMBbls	910.0
Price per Bbl (in USD per Barrel of Oil)	53.83
Price per Bbl (Net of Premium) (in USD per Barrel of Oil)	48.83
Deferred Premium Put Options Q3 2024 [Member]
Volume (MBbls) (Million Barrels of Oil) | MMBbls	920.0
Price per Bbl (in USD per Barrel of Oil)	53.83
Price per Bbl (Net of Premium) (in USD per Barrel of Oil)	48.83
Crude Oil Derivative Swap Q4 2023 [Member]
Volume (MBbls) (Million Barrels of Oil) | MMBbls	0
Price per Bbl (in USD per Barrel of Oil)	0
Deferred Premium Put Options 2024 [Member]
Volume (MBbls) (Million Barrels of Oil) | MMBbls	2,740.0
Price per Bbl (in USD per Barrel of Oil)	53.83
Price per Bbl (Net of Premium) (in USD per Barrel of Oil)	48.83
Crude Oil Derivative Swap 2023 [Member]
Volume (MBbls) (Million Barrels of Oil) | MMBbls	276.0
Price per Bbl (in USD per Barrel of Oil)	72.30
Deferred Premium Put Options Q3 2023 [Member]
Volume (MBbls) (Million Barrels of Oil) | MMBbls	644.0
Price per Bbl (in USD per Barrel of Oil)	60.46
Price per Bbl (Net of Premium) (in USD per Barrel of Oil)	55.46
Deferred Premium Put Options Q4 2023 [Member]
Volume (MBbls) (Million Barrels of Oil) | MMBbls	920.0
Price per Bbl (in USD per Barrel of Oil)	55.97
Price per Bbl (Net of Premium) (in USD per Barrel of Oil)	50.97
Deferred Premium Put Options 2023 [Member]
Volume (MBbls) (Million Barrels of Oil) | MMBbls	1,564.0
Price per Bbl (in USD per Barrel of Oil)	57.82
Price per Bbl (Net of Premium) (in USD per Barrel of Oil)	52.82