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Supplementary Information - Results of Operations from Oil and Gas Producing Activities (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Revenue: |  |
Oil and gas sales | $ 36,973 | $ 84,015
Costs and Expenses: |  |
Lease operating expenses | 23,028 | 33,461
Depreciation, depletion and accretion | 25,921 | 34,616
Income tax expense | (2,515) | 1,421
Total Costs and Expenses | 46,434 | 69,498
Results of Operations from Producing Activities (excluding corporate overhead and interest costs) | $ (9,461) | $ 14,517

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