Note 8 - 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, 2018	Dec. 31, 2017
Crude oil and natural gas sales	$ 9,547,117	$ 7,086,476
Production costs	(3,256,946)	(2,160,029)
Depreciation, depletion and amortization	(637,642)	(940,143)
Accretion expense	(313,641)	(355,127)
Results of operations before income tax benefit	5,338,888	3,631,177
Income tax benefit	(60,000)	(30,000)
Results of operations for oil and gas producing activities (excluding corporate overhead and financing costs)	$ 5,398,888	$ 3,661,177