Note 5 - Derivative Financial Instruments - Price Risk Derivative Contracts (Details) - Not Designated as Hedging Instrument [Member] - Forecast [Member]	3 Months Ended
	Sep. 30, 2025 $ / bbl MBbls	Jun. 30, 2025 $ / bbl MBbls	Mar. 31, 2025 $ / bbl MBbls	Dec. 31, 2024 $ / bbl MBbls	Sep. 30, 2024 $ / bbl MBbls	Jun. 30, 2024 $ / bbl MBbls	Mar. 31, 2024 $ / bbl MBbls
Crude Oil Derivative Swap [Member]
Volume (MBbls) (Thousand Barrels of Oil) | MBbls	3,000	5,500	5,500	5,500	4,000	4,000	4,000
Price per Bbl (in USD per Barrel of Oil)	75.85	76.37	76.37	76.37	84	84	84
Crude Oil Derivative Collar [Member]
Volume (MBbls) (Thousand Barrels of Oil) | MBbls	7,000	7,000	8,000	10,600	1,500	5,500	6,000
Floor price (in USD per Barrel of Oil)	65	65	65	65.68	69	69.73	80
Ceiling price (in USD per Barrel of Oil)	90.08	90.08	90	90.32	95	95	100
Deferred premium payable (in USD per Barrel of Oil)	2.28	2.28	2.12	1.85	0.85	0.61	3.5
Crude Oil Derivative Put [Member]
Volume (MBbls) (Thousand Barrels of Oil) | MBbls	2,000	2,000	2,000	2,000	14,000	14,000	20,000
Floor price (in USD per Barrel of Oil)	58	58	58	58	60.41	60.41	66.44
Deferred premium payable (in USD per Barrel of Oil)	5	5	5	5	5	5	5