Note 18 - Supplemental Crude Oil and Natural Gas Disclosures (Unaudited) (Details Textual)		4 Months Ended	8 Months Ended	12 Months Ended
		Dec. 31, 2020 MMBoe Mcfe	Aug. 21, 2020 MMBoe Mcfe	Dec. 31, 2021 MMBoe Mcfe $ / item	Dec. 31, 2020 MMBoe $ / bbl $ / MMBTU $ / MMcf $ / Boe	Dec. 31, 2021 Mcfe	Dec. 31, 2020 Mcfe	Dec. 31, 2019 MMBoe Mcfe
Proved Developed and Undeveloped Reserve, Net (Energy), Ending Balance (Millions of Barrels of Oil Equivalent)		22,515	10,274	64,213	22,515			11,497
Proved Developed and Undeveloped Reserve, Net (Energy), Period Increase (Decrease), Total (Millions of Barrels of Oil Equivalent)		14,279		44,967
Oil and Gas, Exploratory Well Drilled, Production, Gross, Number		3	3	22
Oil and Gas, Exploratory Well Drilled, Production, Net, Number		3.0	3.0	17.8
Oil and Gas, Exploratory Well Drilled, Completion, Gross, Number		9		15
Oil and Gas, Exploratory Well Drilled, Completion, Net, Number		8.9		11.0
Oil and Gas, Proved Undeveloped Reserves, Well Drilled, Gross, Number		15		53
Oil and Gas, Proved Undeveloped Reserves, Well Drilled, Net Productive, Number		12.4		41.5
Oil and Gas Reserves Aquired (Millions of Barrels of Oil Equivalent)				2,089
Oil and Gas Reserves, Proved Reserve Assets Sold (Millions of Barrels of Oil Equivalent)				305
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy) (Millions of Barrels of Oil Equivalent)		(1,603)	(2,120)	(1,658)
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy), Well Performance (Millions of Barrels of Oil Equivalent)		(1,112)	(1,975)	(2,529)
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy), Increase in Operating Expenses (Millions of Barrels of Oil Equivalent)				85
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy), Price Differentials (Millions of Barrels of Oil Equivalent)		(98)	(173)	956
Proved Developed and Undeveloped Reserve, Production (Energy) (Millions of Barrels of Oil Equivalent)		435	270	3,396
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy), Proved Undeveloped Removed (Millions of Barrels of Oil Equivalent)		(409)
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy), Forecast Operating Expenses (Millions of Barrels of Oil Equivalent)		16	28
Oil and Gas, Well Acquired			3
Proved Developed and Undeveloped Reserve, Purchase of Mineral in Place (Energy) (Millions of Barrels of Oil Equivalent)			50	2,089
Proved Developed and Undeveloped Reserve, Extension and Discovery (Energy) (Millions of Barrels of Oil Equivalent)		14,279	1,117	44,967
Proved Developed Reserves (Energy) (Millions of Barrels of Oil Equivalent)	[1]	10,282		28,585	10,282
Oil [Member]
Oil and Gas, Average Sale Price (in USD per Per Share)				66.56	39.57
Oil and Gas, Estimated Realized Price (in USD per Per Share)				66.10	38.08
Proved Developed and Undeveloped Reserve, Net (Energy), Ending Balance (Millions of Barrels of Oil Equivalent)		19,032	8,633	51,825	19,032			9,372
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy) (Millions of Barrels of Oil Equivalent)		(1,180)	(1,555)	(1,807)
Proved Developed and Undeveloped Reserve, Production (Energy) (Millions of Barrels of Oil Equivalent)		398	236	3,002
Proved Developed and Undeveloped Reserve, Purchase of Mineral in Place (Energy) (Millions of Barrels of Oil Equivalent)			44	973
Proved Developed and Undeveloped Reserve, Extension and Discovery (Energy) (Millions of Barrels of Oil Equivalent)		11,977	1,008	36,867
Proved Developed Reserves (Energy) (Millions of Barrels of Oil Equivalent)	[1]	8,730		22,610	8,730
Natural Gas [Member]
Oil and Gas, Average Sale Price (in USD per Per Share)				3.598	1.985
Oil and Gas, Estimated Realized Price (in USD per Per Share)				0.786	1.304
Proved Developed and Undeveloped Reserve, Net (Energy), Ending Balance (Millions of Barrels of Oil Equivalent)		7,939	3,711	30,061	7,939	30,061,000	7,939,000	4,654
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy) (Millions of Barrels of Oil Equivalent)		(875)	(1,144)	842
Proved Developed and Undeveloped Reserve, Production (Energy) (Millions of Barrels of Oil Equivalent)		112	87	1,020
Proved Developed and Undeveloped Reserve, Purchase of Mineral in Place (Energy) (Millions of Barrels of Oil Equivalent)			36	2,910
Proved Developed and Undeveloped Reserve, Extension and Discovery (Energy) (Millions of Barrels of Oil Equivalent)		5,215	252	19,529
Proved Developed Reserves (Energy) (Millions of Barrels of Oil Equivalent) | Mcfe	[1]					14,611,000	3,572,000
Natural Gas Liquids [Member]
Oil and Gas, Estimated Realized Price (in USD per Per Share)				29.76	12.27
Proved Developed and Undeveloped Reserve, Net (Energy), Ending Balance (Millions of Barrels of Oil Equivalent)		2,160	1,022,000	7,378	2,160	7,378,000	2,160,000	1,349,000
Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy) (Millions of Barrels of Oil Equivalent) | Mcfe		(277,000)	(374,000)	10,000
Proved Developed and Undeveloped Reserve, Production (Energy) (Millions of Barrels of Oil Equivalent) | Mcfe		18,000	20,000	224,000
Proved Developed and Undeveloped Reserve, Purchase of Mineral in Place (Energy) (Millions of Barrels of Oil Equivalent) | Mcfe			0	631
Proved Developed and Undeveloped Reserve, Extension and Discovery (Energy) (Millions of Barrels of Oil Equivalent) | Mcfe		1,433,000	67,000	4,845,000
Proved Developed Reserves (Energy) (Millions of Barrels of Oil Equivalent)	[1]	957		3,540	957
Oil Reserves, Non-producing [Member]
Proved Developed Reserves (Energy) (Millions of Barrels of Oil Equivalent)		4,517		6,884	4,517
Natural Gas Liquids Reserves, Non-producing [Member]
Proved Developed Reserves (Energy) (Millions of Barrels of Oil Equivalent)		517		793	517
Natural Gas Reserves, Non-producing [Member]
Proved Developed Reserves (Energy) (Millions of Barrels of Oil Equivalent)		1,912		3,222	1,912

[1] As of December 31, 2021 and 2020, proved developed reserves includes proved developed non-producing reserves of 6,884 and 4,517 MBbl of crude oil, 793 and 517 MBbl of NGL and 3,222 and 1,912 MMcf of natural gas, respectively