Note 7 - Supplemental Information Relating to Oil and Gas Producing Activities (Unaudited) - Changes in the Standardized Measure of Discounted Future Net Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Balance, beginning of year	$ (3,741)	$ 34,634
Extensions, discoveries and other additions	0	353
Revision of quantity estimates	(236)	(36)
Sales of crude oil and natural gas, net of production costs	(2,265)	(3,227)
Net change in income taxes	10	485
Net changes in prices and production costs	(947)	(50,232)
Accretion of discount	(374)	3,463
Other	1,574	10,819
Balance, end of year	$ (5,979)	$ (3,741)