Note 7 - Oil and Gas Leases - Oil and Gas Leasing Activities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Gross revenues
Royalty interests	$ 500,426	$ 576,976
Lease fees	22,901	4,487
Gross Revenue	523,327	581,463
Production costs	57,454	63,231
Results before income tax expense	465,873	518,232
Estimated income tax expense	135,103	150,287
Results of operations from producing activities excluding corporate overhead	$ 330,770	$ 367,945