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Leases (Charter hire expenses) (Details) - USD ($)	3 Months Ended		6 Months Ended
Leases (Charter hire expenses) (Details) - USD ($)	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Time Charter-in
Charter hire expenses	$ 4,518,850	$ 2,055,000	$ 9,234,448	$ 4,110,000