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Note 3 - Revenue Recognition (Tables) | 9 Months Ended
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Sep. 30, 2025
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
|  | (in thousands) |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rockies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Oil |  | $ | 1,097 |  |  | $ | 1,851 |  |  | $ | 4,012 |  |  | $ | 5,614 |
Natural gas and liquids |  |  | 26 |  |  |  | 45 |  |  |  | 129 |  |  |  | 127 |
Total |  | $ | 1,123 |  |  | $ | 1,896 |  |  | $ | 4,141 |  |  | $ | 5,741 |
West Texas, South Texas, and Gulf Coast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Oil |  | $ | 61 |  |  | $ | 1,107 |  |  | $ | 715 |  |  | $ | 4,513 |
Natural gas and liquids |  |  | (91 | ) |  |  | - |  |  |  | 19 |  |  |  | 114 |
Total |  | $ | (30 | ) |  | $ | 1,107 |  |  | $ | 734 |  |  | $ | 4,627 |
Mid-Continent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Oil |  | $ | 429 |  |  | $ | 1,417 |  |  | $ | 474 |  |  | $ | 4,447 |
Natural gas and liquids |  |  | 216 |  |  |  | 537 |  |  |  | 610 |  |  |  | 1,579 |
Total |  | $ | 645 |  |  | $ | 1,954 |  |  | $ | 1,084 |  |  | $ | 6,026 |
Combined Total |  | $ | 1,738 |  |  | $ | 4,957 |  |  | $ | 5,959 |  |  | $ | 16,394 |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Nine Months Ended |
|  | September 30, |
|  | 2025 |  |  | 2024 |
Purchaser A |  |  | 51 | % |  |  | 26 | %
Purchaser B |  |  | 17 | % |  |  | 26 | %
Purchaser C |  |  | 6 | % |  |  | 4 | %

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