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Note 1 - Organization and Significant Accounting Policies - Future Site Restoration Obligation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Beginning future site restoration obligation $ 4,708 $ 7,360
New wells placed on production and other 0 1
Deletions related to property disposals (1,837) (2,845)
Deletions related to plugging costs 0 (342)
Accretion expense and other 170 330
Revisions and other 0 204
Ending future site restoration obligation $ 3,041 $ 4,708