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Summary of Significant Accounting Policies - Accounts Receivable (Details) - USD ($) | Jun. 30, 2022 | Sep. 30, 2021
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Accounting Policies [Abstract] |  |
Oil, natural gas and NGL sales | $ 31,783,000 | $ 17,008,000
Joint interest accounts receivable | 470,000 | 413,000
Other accounts receivable | 568,000 | 52,000
Total accounts receivable | 32,821,000 | 17,473,000
Allowance for credit losses | $ 0 | $ 0

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