Acquisitions - Narrative (Details) $ / shares in Units, $ in Thousands		3 Months Ended			6 Months Ended
	Feb. 26, 2021 USD ($) $ / shares shares	Mar. 31, 2022 USD ($) $ / shares shares	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2022 USD ($) $ / shares shares	Mar. 31, 2021 USD ($)	Sep. 30, 2021 $ / shares shares	Dec. 31, 2019 USD ($)
Business Acquisition [Line Items]
Common stock, par value (USD per Share) | $ / shares		$ 0.001			$ 0.001		$ 0.001
Reverse stock split			0.083
Common stock outstanding post merger (in Shares) | shares	17,800,000	19,853,649			19,853,649		19,672,050
Transaction costs		$ 2,638	$ 2,164		$ 3,896	$ 3,213
Riley Exploration
Business Acquisition [Line Items]
Total consideration	$ 26,392
Transaction costs, cumulative			5,000			5,000
Transaction costs			2,200			3,100
Transaction costs			$ 2,100	$ 1,000		$ 2,100		$ 3,100
Impairment of oil and gas properties				$ 900
Tengasco
Business Acquisition [Line Items]
Common stock, par value (USD per Share) | $ / shares	$ 0.001
Stock conversion ratio	97.796467
Reverse stock split	0.083