Note 7 - Supplemental Information Relating to Oil and Gas Producing Activities (Unaudited) - Estimated Quantities of Proved Oil and Gas Reserves (Details)	12 Months Ended
	Dec. 31, 2021 bbl Mcf	Dec. 31, 2020 bbl Mcf
Oil [Member]
Beginning Balance | bbl	235,000	329,000
Production | bbl	(36,000)	(31,000)
Revision of previous estimates | bbl	137,000	(63,000)
Ending Balance | bbl	336,000	235,000
Natural Gas [Member]
Beginning Balance | Mcf	5,750,000	13,035,000
Production | Mcf	(2,053,000)	(1,185,000)
Revision of previous estimates | Mcf	12,448,000	(6,100,000)
Ending Balance | Mcf	16,145,000	5,750,000