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Note 5 - Oil and Gas Leases - Company's Royalty and Working Interests Share (Details)	12 Months Ended
	Dec. 31, 2022 Boe Mcfe	Dec. 31, 2021 Boe Mcfe
Natural Gas and Natural Gas Liquids [Member]
Net oil or gas produced (Thousand Cubic Foot Equivalent) | Mcfe	14,891	10,410
Crude Oil and Natural Gas Liquids (NGL) [Member]
Net oil or gas produced (Thousand Cubic Foot Equivalent) | Boe	4,719	5,072

X

- Definition

Energy measure of oil and natural gas production reserves.

+ References

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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1204
-Subsection Instruction 5

+ Details

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Namespace Prefix:	srt_
Data Type:	dtr-types:energyItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_EnergyAxis=srt_NaturalGasPerThousandCubicFeetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_EnergyAxis=srt_CrudeOilAndNGLPerBarrelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: