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, 2019 bbl Mcf	Dec. 31, 2018 bbl Mcf
Oil [Member]
Beginning Balance | bbl	386,000	290,000
Production | bbl	(42,000)	(55,000)
Revision of previous estimates | bbl	(35,000)	151,000
Extensions, discoveries and other additions | bbl	20,000
Ending Balance | bbl	329,000	386,000
Natural Gas [Member]
Beginning Balance | Mcf	16,358,000	11,244,000
Production | Mcf	(1,840,000)	(2,301,000)
Revision of previous estimates | Mcf	(1,578,000)	7,415,000
Extensions, discoveries and other additions | Mcf	95,000
Ending Balance | Mcf	13,035,000	16,358,000