Long-Term Debt (Condensed) (Details) - USD ($)	9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Mar. 31, 2016
Debt obligations
Total debt obligations			$ 787,721,924	$ 836,368,372
Less: deferred financing fees	$ 23,748,116		21,027,494	23,748,116
Total			766,694,430	812,620,256
Presented as follows:
Current portion of long-term debt			65,978,786	66,265,643
Long-term debt—net of current portion and deferred financing fees			700,715,644	746,354,613
Total			766,694,430	812,620,256
Deferred financing fees
Deferred finance fees, beginning	23,748,116
Additions	99,785
Amortization	(2,820,407)	$ (1,553,730)
Deferred finance fees, end	$ 21,027,494
Royal Bank of Scotland plc (RBS)
Debt obligations
Total debt obligations			103,410,000	109,494,500
Tranche A
Debt obligations
Total debt obligations			35,700,000	37,400,000
Tranche B
Debt obligations
Total debt obligations			25,570,000	28,127,000
Tranche C
Debt obligations
Total debt obligations			42,140,000	43,967,500
2015 Debt Facility
Debt obligations
Total debt obligations			684,311,924	726,873,872
Commercial Financing
Debt obligations
Total debt obligations			230,977,160	241,442,384
KEXIM Direct Financing
Debt obligations
Total debt obligations			181,945,598	194,827,596
KEXIM Guaranteed
Debt obligations
Total debt obligations			179,993,011	192,736,763
K-sure Insured
Debt obligations
Total debt obligations			$ 91,396,155	$ 97,867,129