Note 5 - Derivative Financial Instruments - Price Risk Derivative Contracts (Details) - Not Designated as Hedging Instrument [Member]	6 Months Ended
	Jun. 30, 2022 MMBTU $ / shares bbl
Crude Oil Derivative Swap Q3 2022 [Member]
Volume (MBbls) (Barrel of Oil) | bbl	980.8
Price per Bbl (in dollars per share)	88.97
Natural Gas Derivative Swap Q3 2022 [Member]
Volume (MMBtu) (Millions of British Thermal Unit) | MMBTU	460.0
Price per Bbl (in dollars per share)	9.00
Natural Gas Derivative Swap Q4 2022 [Member]
Volume (MMBtu) (Millions of British Thermal Unit) | MMBTU	460.0
Price per Bbl (in dollars per share)	9.00
Crude Oil Derivative Swap Q4 2022 [Member]
Volume (MBbls) (Barrel of Oil) | bbl	1,011.8
Price per Bbl (in dollars per share)	86.13
Natural Gas Derivative Swap 2022 [Member]
Volume (MMBtu) (Millions of British Thermal Unit) | MMBTU	920.0
Price per Bbl (in dollars per share)	9.00
Natural Gas Derivative Swap Q1 2023 [Member]
Volume (MMBtu) (Millions of British Thermal Unit) | MMBTU	450.0
Price per Bbl (in dollars per share)	9.00
Crude Oil Derivative Swap 2022 [Member]
Volume (MBbls) (Barrel of Oil) | bbl	1,992.6
Price per Bbl (in dollars per share)	87.53
Natural Gas Derivative Swap 2023 [Member]
Volume (MMBtu) (Millions of British Thermal Unit) | MMBTU	450.0
Price per Bbl (in dollars per share)	9.00
Crude Oil Derivative Swap Q1 2023 [Member]
Volume (MBbls) (Barrel of Oil) | bbl	441.0
Price per Bbl (in dollars per share)	70.05
Crude Oil Derivative Swap Q2 2023 [Member]
Volume (MBbls) (Barrel of Oil) | bbl	200.2
Price per Bbl (in dollars per share)	57.22
Crude Oil Derivative Swap 2023 [Member]
Volume (MBbls) (Barrel of Oil) | bbl	641.2
Price per Bbl (in dollars per share)	66.04