Note 8 - Oil and Gas Leases - Oil and Gas Leasing Activities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Gross revenues
Royalty interests	$ 4,487	$ 588,121
Lease fees	576,976	21,001
Gross Revenue	581,463	609,122
Production costs	63,231	62,315
Results before income tax expense	518,232	546,807
Estimated income tax expense	150,287	169,510
Results of operations from producing activities excluding corporate overhead	$ 367,945	$ 377,297