Note 8 - Asset Retirement Obligations - Asset Retirement Obligations Activity (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Beginning asset retirement obligations		$ 7,502	$ 4,260	$ 2,293
Liabilities incurred from new wells		445	573	980
Liabilities assumed in acquisitions		2,638	3,219	981
Liabilities divested		(81)	0	(6)
Dispositions		0	0	(25)
Revision of estimates (a)	[1]	2,219	(920)	(130)
Accretion of discount		522	370	167
Ending asset retirement obligations		$ 13,245	$ 7,502	$ 4,260

[1] The revisions to the Company’s asset retirement obligation estimates are primarily due to changes in the ultimate expected useful lives of the properties.