Note 18 - Supplemental Crude Oil and Natural Gas Disclosures (Unaudited) - Quantities of Proved Developed and Undeveloped Reserves (Details) Mcfe in Thousands	Dec. 31, 2022 MMBoe	Dec. 31, 2022 MBoe	Dec. 31, 2022 Mcfe	Dec. 31, 2021 MMBoe	Dec. 31, 2021 MBoe	Dec. 31, 2021 Mcfe	Dec. 31, 2020 MMBoe	Dec. 31, 2020 MBoe	Dec. 31, 2020 Mcfe	Aug. 21, 2020 MMBoe	Aug. 21, 2020 MBoe	Aug. 21, 2020 Mcfe	Dec. 31, 2019 MMBoe	Dec. 31, 2019 Mcfe
Proved Developed Reserves (Millions of Barrels of Oil Equivalent)	61,258			28,585			10,282						4,964
Proved Undeveloped Reserves (Millions of Barrels of Oil Equivalent)	61,700	61,700		35,628	35,628		12,233						6,533
Total Proved Reserves (Millions of Barrels of Oil Equivalent)	122,958	122,958		64,213	64,213		22,515	22,515		10,274	10,274		11,497
Oil [Member]
Proved Developed Reserves (Millions of Barrels of Oil Equivalent)	47,845			22,610			8,730						4,091
Proved Undeveloped Reserves (Millions of Barrels of Oil Equivalent)	50,971			29,215			10,302						5,281
Total Proved Reserves (Millions of Barrels of Oil Equivalent)	98,816			51,825			19,032			8,633			9,372
Natural Gas Liquids [Member]
Proved Developed Reserves (Millions of Barrels of Oil Equivalent)	7,968			3,540			957						548
Proved Undeveloped Reserves (Millions of Barrels of Oil Equivalent)	6,401			3,838			1,203						801
Total Proved Reserves (Millions of Barrels of Oil Equivalent)	14,369		14,369	7,378		7,378	2,160		2,160			1,022	1,349	1,349
Natural Gas [Member]
Proved Developed Reserves (Millions of Barrels of Oil Equivalent) | Mcfe			32,669			14,611			3,572					1,952
Proved Undeveloped Reserves (Millions of Barrels of Oil Equivalent) | Mcfe			25,969			15,450			4,367					2,702
Total Proved Reserves (Millions of Barrels of Oil Equivalent)	58,638		58,638	30,061		30,061	7,939		7,939	3,711			4,654	4,654