Note 2 - Oil and Gas Leases (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

Results of Operations for Oil and Gas Producing Activities Disclosure [Table Text Block]

	2016		2015
Gross revenues
Royalty interests	$	488,947	$	772,212
Lease fees		21,909		13,992
		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

Oil and Gas Net Production, Average Sales Price and Average Production Costs Disclosure [Table Text Block]

	2016		2015
Net gas produced (MCF)		48,959		50,304
Net oil produced (Bbl)		8,447		11,145