Note 17 - Subsequent Events - Commodity Derivative Contracts (Details) - Designated as Hedging Instrument [Member] - Subsequent Event [Member]	Feb. 28, 2022 $ / item
Crude Oil Derivative Swap Q1 2022 [Member]
Volume (MBbls)	966.4
Price per Bbl (in USD per Barrel of Oil)	69.26
Crude Oil Derivative Swap Q2 2022 [Member]
Volume (MBbls)	1,039.8
Price per Bbl (in USD per Barrel of Oil)	71.96
Crude Oil Derivative Swap Q3 2022 [Member]
Volume (MBbls)	456.4
Price per Bbl (in USD per Barrel of Oil)	75.15
Crude Oil Derivative Swap Q4 2022 [Member]
Volume (MBbls)	487.4
Price per Bbl (in USD per Barrel of Oil)	70.14
Crude Oil Derivative Swap 2022 [Member]
Volume (MBbls)	2,950.0
Price per Bbl (in USD per Barrel of Oil)	71.27
Crude Oil Derivative Swap Q1 2023 [Member]
Volume (MBbls)	441.0
Price per Bbl (in USD per Barrel of Oil)	70.05
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)	641.2
Price per Bbl (in USD per Barrel of Oil)	66.04