Note 18 - Supplemental Crude Oil and Natural Gas Disclosures (Unaudited) (Details Textual) Mcfe in Thousands	4 Months Ended				8 Months Ended				12 Months Ended
	Dec. 31, 2020 MMBoe	Dec. 31, 2020 MMBoe MBoe	Dec. 31, 2020 MMBoe Mcfe	Dec. 31, 2020 MMBoe	Aug. 21, 2020 MMBoe	Aug. 21, 2020 MMBoe MBoe	Aug. 21, 2020 MMBoe Mcfe	Aug. 21, 2020 MMBoe	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 $ / Boe	Dec. 31, 2022 MMBoe $ / bbl	Dec. 31, 2022 MMBoe $ / MMBTU	Dec. 31, 2021 MMBoe	Dec. 31, 2021 MMBoe MBoe	Dec. 31, 2021 MMBoe Mcfe	Dec. 31, 2021 MMBoe	Dec. 31, 2021 MMBoe $ / Mcf	Dec. 31, 2021 MMBoe $ / Boe	Dec. 31, 2021 MMBoe $ / bbl	Dec. 31, 2021 MMBoe $ / MMBTU	Dec. 31, 2020 MMBoe $ / Mcf $ / Boe $ / bbl $ / MMBTU	Dec. 31, 2022 MBoe	Dec. 31, 2022 MBbls	Dec. 31, 2022 Mcfe	Dec. 31, 2021 MBoe	Dec. 31, 2021 MMcf	Dec. 31, 2021 MBbls	Dec. 31, 2021 Mcfe	Dec. 31, 2020 MBoe	Dec. 31, 2020 MMcf	Dec. 31, 2020 MBbls	Dec. 31, 2020 Mcfe	Aug. 21, 2020 MBoe	Aug. 21, 2020 Mcfe	Dec. 31, 2019 MMBoe	Dec. 31, 2019 MMcf	Dec. 31, 2019 MBbls	Dec. 31, 2019 Mcfe
Proved Developed and Undeveloped Reserve, Net (Energy), Ending Balance	22,515	22,515	22,515	22,515	10,274	10,274	10,274	10,274	122,958	122,958	122,958	122,958	122,958	122,958	122,958	122,958	64,213	64,213	64,213	64,213	64,213	64,213	64,213	64,213	22,515	122,958			64,213				22,515				10,274		11,497
Proved Developed and Undeveloped Reserve, Net (Energy), Period Increase (Decrease), Total		14,279								57,987								44,967
Oil and Gas, Exploratory Well Drilled, Production, Gross, Number				3				3.0				37								22
Oil and Gas, Exploratory Well Drilled, Production, Net, Number				3.0								(32.1)								17.8
Oil and Gas, Exploratory Well Drilled, Completion, Gross, Number				9								16								15
Oil and Gas, Exploratory Well Drilled, Completion, Net, Number				8.9								(14.8)								11.0
Oil and Gas, Proved Undeveloped Reserves, Well Drilled, Gross, Number				15								80								53
Oil and Gas, Proved Undeveloped Reserves, Well Drilled, Net Productive, Number				12.4								(75.2)								41.5
Oil and Gas Reserves Aquired										18,906								2,089
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy)	1,603	1,603			2,120	2,120			9,211	9,211							1,657	1,657
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy), Well Performance		1,112				1,975				10,418								(2,529)
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy), Price Differentials		(98)				(173)				1,116								957
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy), Increase in Operating Expenses										91								85
Proved Developed and Undeveloped Reserve, Production (Energy)	435	435			270	270			8,937	8,937							3,396	3,396
Oil and Gas Reserves, Proved Reserve Assets Sold																		305
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy), Well Performance		(1,112)				(1,975)				(10,418)								2,529
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy), Well Performance		1,112				1,975				10,418								(2,529)
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy), Proved Undeveloped Removed		409
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy), Price Differentials		98				173				(1,116)								(957)
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy), Forecast Operating Expenses		16				28
Oil and Gas, Well Acquired								3
Proved Developed and Undeveloped Reserve, Purchase of Mineral in Place (Energy)					50	50			18,906								2,089
Proved Developed and Undeveloped Reserve, Extension and Discovery (Energy)	14,279				1,117	1,117			57,987								44,967
Proved Undeveloped Reserves (Energy)	12,233	12,233	12,233	12,233					61,700	61,700	61,700	61,700	61,700	61,700	61,700	61,700	35,628	35,628	35,628	35,628	35,628	35,628	35,628	35,628	12,233	61,700			35,628										6,533
Proved Undeveloped Reserves (Energy), Period Increase (Decrease)										26,072
Oil [Member]
Oil and Gas, Average Sale Price | $ / bbl															93.67								66.56		39.57
Oil and Gas, Estimated Realized Price | $ / bbl															94.59								66.10		38.08
Proved Developed and Undeveloped Reserve, Net (Energy), Ending Balance | MMBoe	19,032	19,032	19,032	19,032	8,633	8,633	8,633	8,633	98,816	98,816	98,816	98,816	98,816	98,816	98,816	98,816	51,825	51,825	51,825	51,825	51,825	51,825	51,825	51,825	19,032														9,372
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy) | MMBoe	1,180				1,555				6,155								1,807
Proved Developed and Undeveloped Reserve, Production (Energy) | MMBoe	398				236				7,562								3,002
Proved Developed and Undeveloped Reserve, Purchase of Mineral in Place (Energy) | MMBoe					44				13,031								973
Proved Developed and Undeveloped Reserve, Extension and Discovery (Energy) | MMBoe	11,977				1,008				47,677								36,867
Proved Undeveloped Reserves (Energy) | MMBoe	10,302	10,302	10,302	10,302					50,971	50,971	50,971	50,971	50,971	50,971	50,971	50,971	29,215	29,215	29,215	29,215	29,215	29,215	29,215	29,215	10,302														5,281
Natural Gas [Member]
Oil and Gas, Average Sale Price | $ / MMBTU																6.358								3.598	1.985
Oil and Gas, Estimated Realized Price													4.871	36.69							0.786	29.76			12.27
Proved Developed and Undeveloped Reserve, Net (Energy), Ending Balance	7,939	7,939	7,939	7,939	3,711	3,711	3,711	3,711	58,638	58,638	58,638	58,638	58,638	58,638	58,638	58,638	30,061	30,061	30,061	30,061	30,061	30,061	30,061	30,061	7,939			58,638				30,061				7,939			4,654			4,654
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy) | MMBoe	875				1,144				7,435								(842)
Proved Developed and Undeveloped Reserve, Production (Energy) | MMBoe	112				87				3,323								1,020
Proved Developed and Undeveloped Reserve, Purchase of Mineral in Place (Energy) | MMBoe					36				14,448								2,910
Proved Developed and Undeveloped Reserve, Extension and Discovery (Energy) | MMBoe	5,215				252				24,887								19,529
Proved Undeveloped Reserves (Energy) | Mcfe																												25,969				15,450				4,367						2,702
Natural Gas Liquids [Member]
Oil and Gas, Estimated Realized Price | $ / Mcf																									1.304
Proved Developed and Undeveloped Reserve, Net (Energy), Ending Balance	2,160	2,160	2,160	2,160					14,369	14,369	14,369	14,369	14,369	14,369	14,369	14,369	7,378	7,378	7,378	7,378	7,378	7,378	7,378	7,378	2,160			14,369				7,378				2,160		1,022	1,349			1,349
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy) | Mcfe			277				374				1,817								(10)
Proved Developed and Undeveloped Reserve, Production (Energy) | Mcfe			18				20				821								224
Proved Developed and Undeveloped Reserve, Purchase of Mineral in Place (Energy) | Mcfe							0				3,467								631
Proved Developed and Undeveloped Reserve, Extension and Discovery (Energy) | Mcfe			1,433				67				6,162								4,845
Proved Undeveloped Reserves (Energy) | MMBoe	1,203	1,203	1,203	1,203					6,401	6,401	6,401	6,401	6,401	6,401	6,401	6,401	3,838	3,838	3,838	3,838	3,838	3,838	3,838	3,838	1,203														801
Oil Reserves, Non-producing [Member]
Proved Developed Reserves (Volume) | MBbls																											7,417				6,884				4,517						3,101
Natural Gas Liquids Reserves, Non-producing [Member]
Proved Developed Reserves (Volume) | MBbls																											927				793				517						447
Natural Gas Reserves, Non-producing [Member]
Proved Developed Reserves (Volume)																											3,641			3,222				1,912						1,454