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Transactions with Related Parties (Details)	3 Months Ended
	Jun. 30, 2017 USD ($) item	Jun. 30, 2016 USD ($)	Mar. 31, 2017 USD ($)	Jul. 26, 2013
Transactions with Related Parties
Fees for chartering and operational services	$ 633,883	$ 552,901
Due from related parties	37,441,188		$ 42,457,000
Eagle Ocean Transport
Transactions with Related Parties
Reimbursed travel and office-related costs	100,000	100,000
Manager
Transactions with Related Parties
Due from related parties	900,000		800,000
Mr. John Hadjipateras | Eagle Ocean Transport
Transactions with Related Parties
Ownership interest (as a percent)				100.00%
Vice President of Chartering, Insurance and Legal, Nigel Grey-Turner | HSSL
Transactions with Related Parties
Ownership interest (as a percent)				100.00%
Helios LPG Pool LLC
Transactions with Related Parties
Due from related parties	$ 56,300,000		61,400,000
Number of vessels that are operating under pooling agreement | item	29
Number of Company vessels that are operating under pooling agreement | item	18
Working capital contributed	$ 19,800,000		$ 19,800,000
Helios LPG Pool LLC | Phoenix
Transactions with Related Parties
Number of third party vessels that are operating under pooling agreement | item	5
Helios LPG Pool LLC | Oriental Energy
Transactions with Related Parties
Number of third party vessels that are operating under pooling agreement | item	6
Other income-related party | Helios LPG Pool LLC
Transactions with Related Parties
Fees for chartering and operational services	$ 500,000	500,000
Other income
Transactions with Related Parties
Fixed reimbursement of expense from Helios		300,000
Other income | Maximum
Transactions with Related Parties
Fixed reimbursement of expense from Helios	100,000
Other income | Manager
Transactions with Related Parties
Fees for chartering and operational services	$ 100,000	$ 100,000

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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