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, 2023 bbl Mcf	Dec. 31, 2022 bbl Mcf
Oil [Member]
Beginning Balance | bbl	398,000	336,000
Extensions, discoveries and other additions | bbl	7,000	2,000
Production | bbl	(33,000)	(34,000)
Revision of previous estimates | bbl	(85,000)	94,000
Ending Balance | bbl	287,000	398,000
Natural Gas [Member]
Beginning Balance | Mcf	21,713,000	16,145,000
Extensions, discoveries and other additions | Mcf	109,000	35,000
Production | Mcf	(1,226,000)	(1,880,000)
Revision of previous estimates | Mcf	(12,643,000)	7,413,000
Ending Balance | Mcf	7,953,000	21,713,000