Leases (Charter hire expenses) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Time Charter-in
Charter hire expenses	$ 4,392,132	$ 2,071,206	$ 13,626,580	$ 6,181,206