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Summary of Significant Accounting Policies - Accounts Receivable (Details) - USD ($)
Jun. 30, 2022
Sep. 30, 2021
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