Note 7 - Supplemental Information Relating to Oil and Gas Producing Activities (Unaudited) - Results of Operations for Oil and Gas Producing Activities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Crude oil and natural gas sales	$ 7,298,279	$ 9,547,117
Production costs	(2,612,507)	(3,256,946)
Depreciation, depletion and amortization	(600,180)	(637,642)
Accretion expense	(273,023)	(313,641)
Results of operations before income tax expense (benefit)	3,812,569	5,338,888
Income tax expense (benefit)	30,000	(60,000)
Results of operations for oil and gas producing activities (excluding corporate overhead and financing costs)	$ 3,782,569	$ 5,398,888