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Note 17 - Supplemental Oil and Natural Gas Information (Unaudited) - Schedule of Changes in Standardized Measure (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Standardized measure, beginning of year | $ 143,788 | $ 19,167
Sales of oil and natural gas, net of production costs | (14,398) | (24,302)
Net changes in prices and production costs | (66,494) | 52,053
Changes in estimated future development costs | (4,834) | (2,860)
Extensions and discoveries | 0 | 0
Purchases of minerals in place | 0 | 116,673
Sale of minerals in place | (16,055) | (1,606)
Revisions in previous quantity estimates | (22,724) | 12,662
Previously estimated development costs incurred | 215 | 0
Net changes in income taxes | 25,874 | (27,021)
Accretion of discount | 14,759 | 10,170
Changes in timing and other | 151 | (11,148)
Standardized measure, end of year | $ 60,282 | $ 143,788

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