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 MMBbls	Jun. 30, 2025 $ / bbl MMBbls	Mar. 31, 2025 $ / bbl MMBbls	Dec. 31, 2024 $ / bbl MMBbls	Sep. 30, 2024 $ / bbl MMBbls	Jun. 30, 2024 $ / bbl MMBbls
Crude Oil Derivative Swap [Member]
Bbls Per Day (Million Barrels of Oil) | MMBbls	3,000	5,500	5,500	5,500	4,000	4,000
Price per Bbl (in USD per Barrel of Oil)	75.85	76.37	76.37	76.37	84	84
Floor or Strike Price per Bbl (in USD per Barrel of Oil)				0	0	0
Ceiling Price per Bbl (in USD per Barrel of Oil)				0	0	0
Deferred Premium Payable per Bbl (in USD per Barrel of Oil)				0	0	0
Crude Oil Derivative Fixed Price Basis Swap [Member]
Bbls Per Day (Million Barrels of Oil) | MMBbls				25,000	25,000	25,000
Price per Bbl (in USD per Barrel of Oil)				1.12	1.12	1.12
Floor or Strike Price per Bbl (in USD per Barrel of Oil)					0	0
Ceiling Price per Bbl (in USD per Barrel of Oil)					0	0
Deferred Premium Payable per Bbl (in USD per Barrel of Oil)					0	0
Crude Oil Derivative Collar [Member]
Bbls Per Day (Million Barrels of Oil) | MMBbls	7,000	7,000	8,000	10,600	1,500	5,500
Price per Bbl (in USD per Barrel of Oil)					0	0
Floor or Strike Price per Bbl (in USD per Barrel of Oil)	65	65	65	65.68	69	69.73
Ceiling Price per Bbl (in USD per Barrel of Oil)	90.08	90.08	90	90.32	95	95
Deferred Premium Payable per Bbl (in USD per Barrel of Oil)	2.28	2.28	2.12	1.85	0.85	0.61
Crude Oil Derivative Put [Member]
Bbls Per Day (Million Barrels of Oil) | MMBbls	2,000	2,000	2,000	2,000	14,000	14,000
Price per Bbl (in USD per Barrel of Oil)					0	0
Floor or Strike Price per Bbl (in USD per Barrel of Oil)	58	58	58	58	60.41	60.41
Ceiling Price per Bbl (in USD per Barrel of Oil)					0	0
Deferred Premium Payable per Bbl (in USD per Barrel of Oil)	5	5	5	5	5	5