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Note 3 - Revenue Recognition (Tables) | 6 Months Ended
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Jun. 30, 2024
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
|  | (in thousands) |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rockies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Oil |  | $ | 2,042 |  |  | $ | 2,470 |  |  | $ | 3,763 |  |  | $ | 4,809 |
Natural gas and liquids |  |  | 41 |  |  |  | 128 |  |  |  | 82 |  |  |  | 216 |
Total |  | $ | 2,083 |  |  | $ | 2,598 |  |  | $ | 3,845 |  |  | $ | 5,025 |
West Texas, South Texas, and Gulf Coast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Oil |  | $ | 1,807 |  |  | $ | 3,022 |  |  | $ | 3,406 |  |  | $ | 5,977 |
Natural gas and liquids |  |  | 69 |  |  |  | 112 |  |  |  | 115 |  |  |  | 321 |
Total |  | $ | 1,876 |  |  | $ | 3,134 |  |  | $ | 3,521 |  |  | $ | 6,298 |
Mid-Continent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Oil |  | $ | 1,623 |  |  | $ | 1,536 |  |  | $ | 3,030 |  |  | $ | 3,338 |
Natural gas and liquids |  |  | 464 |  |  |  | 710 |  |  |  | 1,041 |  |  |  | 1,590 |
Total |  | $ | 2,087 |  |  | $ | 2,246 |  |  | $ | 4,071 |  |  | $ | 4,928 |
Combined Total |  | $ | 6,046 |  |  | $ | 7,978 |  |  | $ | 11,437 |  |  | $ | 16,251 |
Schedules of Concentration of Risk, by Risk Factor [Table Text Block] |
|  | Six Months Ended |
|  | June 30, |
|  | 2024 |  |  | 2023 |
Purchaser A |  |  | 28 | % |  |  | 23 | %
Purchaser B |  |  | 25 | % |  |  | 18 | %
Purchaser C |  |  | 11 | % |  |  | 9 | %

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