Commitments and Contingencies (Details)	3 Months Ended
	Jun. 30, 2019 USD ($) item	Jun. 30, 2018 USD ($)
Commitments under Contracts for Scrubber Purchases
Number of VLGCs with scrubber purchase commitments | item	10
Less than one year	$ 9,955,572
Total	$ 9,955,572
Commitments under Contracts for BWMS Purchases
Number of vessels that had contracts to purchase ballast water management systems | item	2
Less than one year	$ 703,360
Total	703,360
Operating Leases
Operating lease rent expense	122,352	$ 127,482
Commitments under Operating Leases
Less than one year	410,667
One to three years	429,227
Total	839,894
Time Charter-in
Charter hire expenses	$ 2,055,000
Time Charter-in commitments
Number of VLGC with charter-in commitments | item	1
Less than one year	$ 5,480,000
Total	5,480,000
Fixed Time Charter Commitments
Less than one year	23,993,113
One to three years	22,293,252
Total	$ 46,286,365