Note 5 - Derivative Financial Instruments - Price Risk Derivative Contracts (Details) - Not Designated as Hedging Instrument [Member]	3 Months Ended
	Mar. 31, 2023 $ / bbl MMBbls
Volume (MBbls) (Million Barrels of Oil) | MMBbls	822.0
Price per Bbl (in USD per Barrel of Oil)	69.32
Deferred Premium Put Options Q1 2024 [Member]
Volume (MBbls) (Million Barrels of Oil) | MMBbls	455.0
Price per Bbl (in USD per Barrel of Oil)	51.50
Price per Bbl (Net of Premium) (in USD per Barrel of Oil)	46.50
Crude Oil Derivative Swap Q2 2023 [Member]
Volume (MBbls) (Million Barrels of Oil) | MMBbls	546.0
Price per Bbl (in USD per Barrel of Oil)	67.81
Deferred Premium Put Options Q2 2024 [Member]
Volume (MBbls) (Million Barrels of Oil) | MMBbls	455.0
Price per Bbl (in USD per Barrel of Oil)	51.50
Price per Bbl (Net of Premium) (in USD per Barrel of Oil)	46.50
Deferred Premium Put Options Q3 2024 [Member]
Volume (MBbls) (Million Barrels of Oil) | MMBbls	460.0
Price per Bbl (in USD per Barrel of Oil)	51.50
Price per Bbl (Net of Premium) (in USD per Barrel of Oil)	46.50
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 2024 [Member]
Volume (MBbls) (Million Barrels of Oil) | MMBbls	1,370.0
Price per Bbl (in USD per Barrel of Oil)	51.50
Price per Bbl (Net of Premium) (in USD per Barrel of Oil)	46.50
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 Q2 2023 [Member]
Volume (MBbls) (Million Barrels of Oil) | MMBbls	364.0
Price per Bbl (in USD per Barrel of Oil)	61.05
Price per Bbl (Net of Premium) (in USD per Barrel of Oil)	56.05
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	1,928.0
Price per Bbl (in USD per Barrel of Oil)	58.43
Price per Bbl (Net of Premium) (in USD per Barrel of Oil)	53.43