Leases (assets and liabilities) (Details)	3 Months Ended		9 Months Ended
	Dec. 31, 2021 USD ($) item	Dec. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) item	Dec. 31, 2020 USD ($)	Mar. 31, 2021 USD ($)
Leases
Number of option period for time charter | item	0		0
Operating lease liabilities - Time Charter in VLGCs	$ 10,200,000		$ 10,200,000
Operating Lease, Expense	$ 148,384	$ 139,568	$ 464,394	$ 401,435
Weighted average discount rate (as a percent)	3.88%		3.88%
Weighted average remaining lease term	12 months 27 days		12 months 27 days
Operating lease right-of-use assets - Office Leases	$ 303,810		$ 303,810
Operating lease right-of-use assets - Time Charter in VLGCs	10,213,986		10,213,986
Operating lease liabilities current - Office Leases	291,241		291,241
Operating lease liabilities current - Time Charter in VLGCs	9,413,540		9,413,540
Operating lease liabilities non-current - Office Leases	2,347		2,347
Operating lease liabilities non-current - Time Charter in VLGCs	800,446		800,446
Operating lease right-of-use assets	10,517,796		10,517,796		$ 17,672,227
Operating lease liability	10,507,574		10,507,574
Charter hire expense
Leases
Operating lease income	$ 5,500,000	$ 8,700,000	$ 12,300,000	$ 20,200,000
Minimum
Leases
Weighted average discount rate (as a percent)	3.82%		3.82%
Maximum
Leases
Weighted average discount rate (as a percent)	5.53%		5.53%