Commitments and Contingencies (Details)	12 Months Ended
	Mar. 31, 2019 USD ($) item	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)
Commitments under Contracts for Scrubber Purchases
Number of VLGCs with scrubber purchase commitments | item	10
Less than one year	$ 9,785,394
One to three years	231,722
Three to five years	897,395
Total	$ 10,914,511
Commitments under Contracts for BWMS Purchases
Number of vessels that had contracts to purchase ballast water management systems | item	2
Less than one year	$ 1,004,800
Total	1,004,800
Operating Leases
Operating lease rent expense	471,425	$ 426,155	$ 415,928
Commitments under Operating Leases
Less than one year	422,604
One to three years	485,120
Three to five years	12,413
Total	920,137
Time Charter-in
Charter hire expenses	$ 237,525
Time Charter-in commitments
Number of VLGC with charter-in commitments | item	1
Less than one year	$ 7,535,000
Total	7,535,000
Fixed time charter
Fixed Time Charter Commitments
Less than one year	29,100,613
One to three years	27,505,752
Total	$ 56,606,365