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Subsequent Events	12 Months Ended
Subsequent Events	Sep. 30, 2021
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On October 7, 2021, the Board of Directors of the Company declared a cash dividend of $0.31 per share of common stock, payable on November 4, 2021 to its shareholders of record at the close of business on October 21, 2021. Effective October 7, 2021, the Company executed two agreements related to its EOR project. The first agreement is a CO2 purchase agreement with Kinder Morgan CO2 Company, LLC and the second agreement is a connection agreement that also established a delivery point for the purchased CO2 with the Cortez Pipeline Company. Effective October 12, 2021, the Company amended its revolving credit facility to increase the borrowing base and elected commitments of the lenders thereto from $135 million to $175 million. See further discussion in Note - 9 Revolving Credit Facility.