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Transactions with Related Parties (Details)		3 Months Ended		6 Months Ended
Transactions with Related Parties (Details)	Apr. 01, 2015 item	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) item	Sep. 30, 2021 USD ($)	Mar. 31, 2022 USD ($)
Transactions with Related Parties
Due from related parties - current		$ 55,473,796		$ 55,473,796		$ 57,782,831
Due to related parties		25,520		$ 25,520		37,433
Number of time chartered-in VLGC \| item				2
Manager
Transactions with Related Parties
Due from related parties - current		$ 800,000		$ 800,000		1,000,000.0
Mr. John Hadjipateras
Transactions with Related Parties
Ownership interest (as a percent)		100.00%		100.00%
Helios LPG Pool LLC
Transactions with Related Parties
Due from related parties		$ 74,400,000		$ 74,400,000		76,500,000
Due from related parties - current		2,200,000		$ 2,200,000		3,300,000
Due to related parties						100,000
Ownership interest (as a percent)	50.00%
Number of board members from each joint venture \| item	2
Number of vessels that are operating under pooling agreement \| item				23
Number of time chartered-in VLGC \| item				2
Number of Company vessels that are operating under pooling agreement \| item				20
Working capital contributed		22,000,000.0		$ 22,000,000.0		$ 23,100,000
Helios LPG Pool LLC \| Phoenix
Transactions with Related Parties
Number of vessels that are operating under pooling agreement \| item				3
Other income-related party \| Manager \| Maximum
Transactions with Related Parties
Related party income for chartering and operational services		100,000	$ 100,000	$ 100,000	$ 100,000
Other income-related party \| Helios LPG Pool LLC
Transactions with Related Parties
Related party income for chartering and operational services		500,000	500,000	1,100,000	1,100,000
Fixed reimbursement of expense from Helios				$ 500,000	$ 1,500,000
Other revenues, net
Transactions with Related Parties
Fixed reimbursement of expense from Helios		$ 100,000	$ 800,000