Summary of Significant Accounting Policies (Details) T in Millions	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2023 USD ($) shares	Mar. 31, 2023 item	Jun. 30, 2022 USD ($) shares	Jun. 30, 2023 USD ($) segment T shares	Jun. 30, 2022 USD ($) shares	Dec. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)
Significant accounting policies
Number of reportable segments | segment				1
Stepdown from baseline levels, final rule				10.00%
Cumulative reduction in baseline, subsequent allowance				40.00%
Allocation allowance received | T				3
Allocation allowance received as a percentage of total HFC consumption				1.00%
Number of reporting unit | item		1
Goodwill impairment loss				$ 0		$ 0
Cylinder deposit liability	$ 15,900,000			15,900,000		13,600,000
Operating loss carryforwards	$ 1,800,000			$ 1,800,000
Deferred tax assets, valuation allowance			$ 11,600,000		$ 11,600,000	3,500,000	$ 3,500,000	$ 15,100,000
Options excluded from the calculation of diluted shares | shares	602,321		752	499,857	1,090
Federal
Significant accounting policies
Operating loss carryforwards	$ 0			$ 0
Current year utilization comprise of deferred tax						$ 29,300,000
Customer Concentration Risk | No Customer | Revenue from Contract with Customer
Significant accounting policies
Concentration risk percentage				10.00%
Customer Concentration Risk | One Customer | Revenue from Contract with Customer
Significant accounting policies
Accounts receivable	$ 14,600,000			$ 14,600,000
Customer Concentration Risk | One Customer | Accounts Receivable
Significant accounting policies
Accounts receivable			$ 10,000,000		$ 10,000,000