Note 17 - Supplemental Crude Oil and Natural Gas Disclosures (Unaudited) (Details Textual) Mcfe in Thousands	12 Months Ended
	Dec. 31, 2023 MMBoe	Dec. 31, 2023 MMBoe MBoe	Dec. 31, 2023 MMBoe Mcfe	Dec. 31, 2023 MMBoe	Dec. 31, 2023 MMBoe $ / Mcf	Dec. 31, 2023 MMBoe $ / MMBTU	Dec. 31, 2023 MMBoe $ / bbl	Dec. 31, 2022 MMBoe	Dec. 31, 2022 MMBoe MBoe	Dec. 31, 2022 MMBoe Mcfe	Dec. 31, 2022 MMBoe	Dec. 31, 2022 MMBoe $ / Mcf	Dec. 31, 2022 MMBoe $ / MMBTU	Dec. 31, 2022 MMBoe $ / bbl	Dec. 31, 2021 MMBoe MBoe Mcfe $ / Mcf $ / MMBTU $ / bbl	Dec. 31, 2023 MBbls	Dec. 31, 2023 Mcfe	Dec. 31, 2022 MBbls	Dec. 31, 2022 Mcfe	Dec. 31, 2021 MMcf	Dec. 31, 2021 MBbls	Dec. 31, 2021 Mcfe	Dec. 31, 2020 MMBoe Mcfe MMcf MBbls
Proved Developed and Undeveloped Reserve, Net (Energy)	154,162	154,162	154,162	154,162	154,162	154,162	154,162	122,958	122,958	122,958	122,958	122,958	122,958	122,958	64,213								22,515
Proved Developed and Undeveloped Reserve, Net (Energy), Period Increase (Decrease)	65,148								57,987						44,967
Oil and Gas, Exploratory Well Drilled, Production, Gross, Number				63							37				22
Oil and Gas, Exploratory Well Drilled, Production, Net, Number				(56.4)							(32.1)				17.8
Oil and Gas, Exploratory Well Drilled, Completion, Gross, Number				7							16				15
Oil and Gas, Exploratory Well Drilled, Completion, Net, Number				(6.6)							(14.8)				11
Oil and Gas, Proved Undeveloped Reserves, Well Drilled, Gross, Number				117							80				53
Oil and Gas, Proved Undeveloped Reserves, Well Drilled, Net Productive, Number				(102.4)							(75.2)				41.5
Oil and Gas Reserves Aquired	171								18,906						2,089
Oil and Gas Reserves, Proved Reserve Assets Sold	1,387														305
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy)	(16,093)							(9,211)	(921)						(1,657)
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy), Well Performance	13,729								(10,418)						2,529
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy), Increase in Operating Expenses	1,775								91						85
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy), Price Differentials	589								1,116						957
Proved Developed and Undeveloped Reserve, Production (Energy)	16,635							8,937							3,396
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy)	16,093							9,211	921						1,657
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy), Well Performance	(13,729)								10,418						(2,529)
Proved Undeveloped Reserves (Energy)	74,569	74,569	74,569	74,569	74,569	74,569	74,569	61,700	61,700	61,700	61,700	61,700	61,700	61,700	35,628
Proved Undeveloped Reserves (Energy), Period Increase (Decrease) | MBoe		12,869
Oil [Member]
Oil and Gas, Average Sale Price | $ / bbl							78.22							93.67	66.56
Oil and Gas, Estimated Realized Price | $ / bbl							78.13							94.59	66.1
Proved Developed and Undeveloped Reserve, Net (Energy)	119,554	119,554	119,554	119,554	119,554	119,554	119,554	98,816	98,816	98,816	98,816	98,816	98,816	98,816	51,825								19,032
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy)	(18,432)							(6,155)							(1,807)
Proved Developed and Undeveloped Reserve, Production (Energy)	13,885							7,562							3,002
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy)	18,432							6,155							1,807
Proved Undeveloped Reserves (Energy)	60,923	60,923	60,923	60,923	60,923	60,923	60,923	50,971	50,971	50,971	50,971	50,971	50,971	50,971	29,215
Natural Gas [Member]
Oil and Gas, Average Sale Price | $ / MMBTU						2.637							6.358		3.598
Oil and Gas, Estimated Realized Price					0.198	17.33						4.871	36.69		29.76
Proved Developed and Undeveloped Reserve, Net (Energy)	87,071	87,071	87,071	87,071	87,071	87,071	87,071	58,638	58,638	58,638	58,638	58,638	58,638	58,638	30,061		87,071		58,638			30,061	7,939
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy)	8,644							(7,435)							842
Proved Developed and Undeveloped Reserve, Production (Energy)	7,218							3,323							1,020
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy)	(8,644)							7,435							(842)
Proved Undeveloped Reserves (Energy) | Mcfe																	34,400		25,969			15,450
Natural Gas Liquids [Member]
Oil and Gas, Estimated Realized Price | $ / Mcf															0.786
Proved Developed and Undeveloped Reserve, Net (Energy)	20,096	20,096	20,096	20,096	20,096	20,096	20,096	14,369	14,369	14,369	14,369	14,369	14,369	14,369	7,378		20,096		14,369			7,378	2,160
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy) | Mcfe			898							(1,817)					10
Proved Developed and Undeveloped Reserve, Production (Energy) | Mcfe			1,547							821					224
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy) | Mcfe			(898)							1,817					(10)
Proved Undeveloped Reserves (Energy)	7,913	7,913	7,913	7,913	7,913	7,913	7,913	6,401	6,401	6,401	6,401	6,401	6,401	6,401	3,838
Oil Reserves, Non-producing [Member]
Proved Developed Reserves (Volume) | MBbls																4,598		7,417			6,884		4,517
Natural Gas Liquids Reserves, Non-producing [Member]
Proved Developed Reserves (Volume) | MBbls																534		927			793		517
Natural Gas Reserves, Non-producing [Member]
Proved Developed Reserves (Volume)																1,889		3,641		3,222			1,912