Note 2 - Oil and Gas Leases - Oil and Gas Leasing Activities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Gross revenues
Royalty interests	$ 488,947	$ 772,212
Lease fees	21,909	13,992
Gross Revenue	510,856	786,204
Production costs	47,212	70,240
Results before income tax expense	463,644	715,964
Estimated income tax expense	97,365	286,386
Results of operations from producing activities excluding corporate overhead	$ 366,279	$ 429,578