Note 7 - Oil and Gas Leases (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

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

	2019		2018
Gross revenues
Royalty interests	$	500,426	$	576,976
Lease fees		22,901		4,487
		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

Oil and Gas, Average Sale Price and Production Cost [Table Text Block]

	2019		2018
Net gas produced (MCF)		32,107		25,776
Net oil produced (Bbl)		6,272		6,956