Note 5 - Oil and Gas Leases - Oil and Gas Leasing Activities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Gross revenues
Royalty interests	$ 380,654	$ 596,755
Lease fees	0	0
Results of Operations, Revenue from Oil and Gas Producing Activities	380,654	596,755
Production costs	(41,677)	(50,312)
Results before income tax expense	338,977	546,443
Estimated income tax expense	(86,917)	(140,155)
Results of operations from producing activities excluding corporate overhead	$ 252,060	$ 406,288