Commitments and Contingencies (Details)	3 Months Ended		6 Months Ended
	Sep. 30, 2019 USD ($) item	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) item	Sep. 30, 2018 USD ($)
Commitments under Contracts for Scrubber Purchases
Less than one year	$ 8,810,894		$ 8,810,894
Total	$ 8,810,894		$ 8,810,894
Commitments under Contracts for BWMS Purchases
Number of vessels that had contracts to purchase ballast water management systems | item	1		1
Less than one year	$ 367,712		$ 367,712
Total	367,712		367,712
Operating Leases
Operating lease rent expense	127,664	$ 106,117	250,016	$ 233,599
Commitments under Operating Leases
Less than one year	502,064		502,064
One to three years	507,450		507,450
Total	1,009,514		1,009,514
Time Charter-in
Charter hire expenses	$ 2,055,000		$ 4,110,000
Time Charter-in commitments
Number of VLGC with charter-in commitments | item	1		1
Number of VLGC with charter-in commitments to be delivered | item	1		1
Less than one year	$ 8,325,000		$ 8,325,000
One to three years	3,500,000		3,500,000
Total	11,825,000		11,825,000
Fixed Time Charter Commitments
Less than one year	30,685,613		30,685,613
One to three years	36,640,752		36,640,752
Three to five years	815,000		815,000
Total	$ 68,141,365		$ 68,141,365