Vessel Operating Expenses (Details) - USD ($)	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Vessel Operating Expenses.
Crew wages and related costs	$ 42,683,848	$ 41,649,202	$ 42,807,373
Spares and stores	13,249,931	10,625,997	8,730,107
Repairs and maintenance costs	4,416,259	5,594,957	4,028,775
Insurance	4,173,052	3,452,874	3,758,485
Lubricants	3,607,749	3,206,445	2,677,177
Miscellaneous expenses	3,347,530	2,351,093	2,310,727
Total	$ 71,478,369	$ 66,880,568	$ 64,312,644