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Note 5 - Oil and Gas Leases - Company's Royalty and Working Interests Share (Details)	12 Months Ended
	Dec. 31, 2023 Boe Mcfe	Dec. 31, 2022 Boe Mcfe
Natural Gas and Natural Gas Liquids [Member]
Net oil or gas produced (Thousand Cubic Foot Equivalent) | Mcfe	8,976	14,891
Crude Oil and Natural Gas Liquids (NGL) [Member]
Net oil or gas produced (Thousand Cubic Foot Equivalent) | Boe	3,826	4,719

X

- Definition

Energy measure of oil and natural gas production reserves.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Regulation S-K (SK)
-Number 229
-Section 1204
-Subsection Instruction 5
-Publisher SEC

+ Details

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X

- Details

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X

- Details

Name:	srt_EnergyAxis=srt_CrudeOilAndNGLPerBarrelMember
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