Vessels, Net (Details) - USD ($)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Vessels, Net
Vessels, net	$ 1,238,061,690	$ 1,377,028,255
Vessels
Vessels, Net
Vessels, net	1,238,061,690	1,377,028,255	$ 1,437,658,833
Cost
Balance at the beginning of the period	1,762,657,830	1,757,285,233
Other additions	6,575,263	5,372,597
Disposals	(131,157,644)
Balance at the end of the period	1,638,075,449	1,762,657,830
Accumulated depreciation
Balance at the beginning of the period	(385,629,575)	(319,626,400)
Disposals accumulated depreciation	49,063,637
Impairment	0	0
Disposals net book value	(82,094,007)
Depreciation	(63,447,821)	(66,003,175)
Balance at the end of the period	(400,013,759)	(385,629,575)
Mortgaged VLGC vessels, carrying value	1,198,700,000	$ 1,337,400,000
CMNL
Accumulated depreciation
Gain loss on vessel held for sale	3,500,000
CNML
Accumulated depreciation
Gain loss on vessel held for sale	$ 3,800,000