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Summary of Significant Accounting Policies - Accounts Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Accounting Policies [Abstract]    
Oil, natural gas and NGL sales $ 17,008 $ 6,919
Joint interest accounts receivable 413 1,022
Realized derivative receivable 42 2,187
Other accounts receivable 10 0
Total accounts receivable $ 17,473 $ 10,128