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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, 2019 | Dec. 31, 2018
Revenue: |  |
Oil and gas sales | $ 84,015 | $ 93,215
Costs and Expenses: |  |
Lease operating expenses | 33,461 | 34,996
Depreciation, depletion and accretion | 34,616 | 36,154
Income tax expense | 1,421 | 3,724
Total Costs and Expenses | 69,498 | 74,874
Results of Operations from Producing Activities (excluding corporate overhead and interest costs) | $ 14,517 | $ 18,341

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