Note 17 - Subsequent Events - Commodity Derivative Contracts (Details) - Designated as Hedging Instrument [Member] - Subsequent Event [Member]	Oct. 01, 2021 $ / item
Crude Oil Derivative Swap Q4 2021 [Member]
Volume (MBbls)	540.6
Price per Bbl (in USD per Barrel of Oil)	64.35
Crude Oil Derivative Swap Q1 2022 [Member]
Volume (MBbls)	684.0
Price per Bbl (in USD per Barrel of Oil)	67.52
Crude Oil Derivative Swap Q2 2022 [Member]
Volume (MBbls)	441.5
Price per Bbl (in USD per Barrel of Oil)	66.59
Crude Oil Derivative Swap Q3 2022 [Member]
Volume (MBbls)	146.0
Price per Bbl (in USD per Barrel of Oil)	65.88
Crude Oil Derivative Swap Q4 2022 [Member]
Volume (MBbls)	239.0
Price per Bbl (in USD per Barrel of Oil)	59.37
Crude Oil Derivative Swap 2022 [Member]
Volume (MBbls)	1,510.5
Price per Bbl (in USD per Barrel of Oil)	65.80
Crude Oil Derivative Swap Q1 2023 [Member]
Volume (MBbls)	198.0
Price per Bbl (in USD per Barrel of Oil)	57.22
Crude Oil Derivative Swap Q2 2023 [Member]
Volume (MBbls)	200.2
Price per Bbl (in USD per Barrel of Oil)	57.22
Crude Oil Derivative Swap 2023 [Member]
Volume (MBbls)	398.2
Price per Bbl (in USD per Barrel of Oil)	57.22