Leases (assets and liabilities) (Details)	3 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)
Leases
Number of option period for time charter	0
Operating lease liabilities - Time Charter in VLGCs	$ 10,200,000
Operating lease income	$ 6,800,000	$ 4,100,000
Lease term	12 months
Weighted average discount rate (as a percent)	4.60%
Weighted average remaining lease term	13 months
Operating lease right-of-use assets - Office Leases	$ 859,045
Operating lease right-of-use assets - Time Charter in VLGCs	5,551,015
Operating lease liabilities current - Office Leases	234,512
Operating lease liabilities current - Time Charter in VLGCs	5,551,015
Operating lease liabilities non-current - Office Leases	$ 622,769
Minimum
Leases
Weighted average discount rate (as a percent)	3.82%
Maximum
Leases
Weighted average discount rate (as a percent)	5.53%