Note 17 - Supplemental Oil and Natural Gas Information (Unaudited) (Tables)
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12 Months Ended |
Dec. 31, 2025 |
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| Notes Tables |
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| Oil and Gas, Cost Incurred, Property Acquisition, Exploration, and Development [Table Text Block] |
| | | 2025 | | | 2024 | |
| | | (in thousands) | |
| Proved property acquisition | | $ | - | | | $ | - | |
| Development (1) | | | - | | | | 1,213 | |
| Exploration | | | - | | | | - | |
| | | | | | | | | |
| Total | | $ | - | | | $ | 1,213 | |
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| Oil and Gas, Capitalized Cost [Table Text Block] |
| | | 2025 | | | 2024 | |
| | | (in thousands) | |
| Oil and Natural Gas Properties: | | | | | | | | |
| Evaluated properties in full cost pool (1) | | | 132,459 | | | | 142,029 | |
| Less accumulated depletion (2) | | | (117,237 | ) | | | (112,958 | ) |
| | | | | | | | | |
| Net capitalized costs | | $ | 15,222 | | | $ | 29,071 | |
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| Oil and Gas, Result of Operation, Producing Activity [Table Text Block] |
| | | 2025 | | | 2024 | |
| | | (in thousands) | |
| Oil and natural gas sales | | $ | 7,353 | | | $ | 20,619 | |
| Lease operating expense | | | (5,174 | ) | | | (11,160 | ) |
| Gathering, treating, and transportation costs | | | (59 | ) | | | (205 | ) |
| Production taxes | | | (539 | ) | | | (1,213 | ) |
| Depletion | | | (2,261 | ) | | | (6,369 | ) |
| Income tax (expense) benefit | | | (6 | ) | | | (20 | ) |
| | | | | | | | | |
| Results of operations from oil and natural gas producing activities | | $ | (686 | ) | | $ | 1,652 | |
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| Oil and Gas, Proved Reserve, Quantity [Table Text Block] |
| | | 2025 | | | 2024 | |
| | | Oil | | | Gas | | | Oil | | | Gas | |
| | | (bbls) | | | (mcfe) (1) | | | (bbls) | | | (mcfe) (1) | |
| | | | | | | | | | | | | | | | | |
| Total proved reserves: | | | | | | | | | | | | | | | | |
| Reserve quantities, beginning of year | | | 1,592,306 | | | | 2,306,915 | | | | 3,182,861 | | | | 10,082,386 | |
| Revisions of previous estimates | | | (120,898 | ) | | | 220,809 | | | | (515,318 | ) | | | (2,546,079 | ) |
| Discoveries and extensions | | | - | | | | - | | | | - | | | | - | |
| Purchases of minerals in place | | | - | | | | - | | | | - | | | | - | |
| Sale of minerals in place | | | (271,457 | ) | | | (27,997 | ) | | | (819,071 | ) | | | (4,271,067 | ) |
| Production | | | (112,797 | ) | | | (311,729 | ) | | | (256,166 | ) | | | (958,325 | ) |
| | | | | | | | | | | | | | | | | |
| Reserve quantities, end of year | | | 1,087,155 | | | | 2,187,999 | | | | 1,592,306 | | | | 2,306,915 | |
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| Oil and Gas, Average Sale Price and Production Cost [Table Text Block] |
| | | 2025 | | | 2024 | |
| | | | | | | | | |
| Oil per Bbl | | $ | 65.34 | | | $ | 75.48 | |
| Gas per Mmbtu | | $ | 3.39 | | | $ | 2.13 | |
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| Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow [Table Text Block] |
| | | 2025 | | | 2024 | |
| | | (in thousands) | |
| Future cash inflows | | $ | 71,278 | | | $ | 117,237 | |
| Future cash outflows: | | | | | | | | |
| Production costs | | | (35,496 | ) | | $ | (63,555 | ) |
| Development costs | | | (9,988 | ) | | | (28,142 | ) |
| Income taxes | | | - | | | | - | |
| | | | | | | | | |
| Future net cash flows | | | 25,794 | | | $ | 25,540 | |
| 10% annual discount factor | | | (9,066 | ) | | | (1,714 | ) |
| | | | | | | | | |
| Standardized measure of discounted future net cash flows | | $ | 16,728 | | | $ | 23,826 | |
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| Oil and Gas, Change in Standardized Measure, Discounted Future Net Cash Flow [Table Text Block] |
| | | 2025 | | | 2024 | |
| | | (in thousands) | |
| Standardized measure, beginning of year | | $ | 23,826 | | | $ | 60,282 | |
| Sales of oil and natural gas, net of production costs | | | (1,581 | ) | | | (7,978 | ) |
| Net changes in prices and production costs | | | (4,829 | ) | | | (1,303 | ) |
| Changes in estimated future development costs | | | 3,017 | | | | 1,788 | |
| Sale of minerals in place | | | (3,577 | ) | | | (23,116 | ) |
| Revisions in previous quantity estimates | | | (1,089 | ) | | | (14,188 | ) |
| Previously estimated development costs incurred | | | 231 | | | | 374 | |
| Net changes in income taxes | | | - | | | | 2,611 | |
| Accretion of discount | | | 2,499 | | | | 6,073 | |
| Changes in timing and other | | | (1,770 | ) | | | (717 | ) |
| | | | | | | | | |
| Standardized measure, end of year | | $ | 16,727 | | | $ | 23,826 | |
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