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Long-term Debt (Details) - USD ($)	9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Jul. 23, 2019	Mar. 31, 2019	Mar. 31, 2015
Debt obligations
Total debt obligations			$ 662,120,307		$ 710,096,616
Less: deferred financing fees	$ 11,846,890		11,846,890		14,005,830
Total			650,273,417		696,090,786
Presented as follows:
Current portion of long-term debt			63,968,414		63,968,414
Long-term debt—net of current portion and deferred financing fees			586,305,003		632,122,372
Total			650,273,417		696,090,786
Deferred financing fees
Deferred finance fees, beginning	14,005,830
Additions	40,547
Amortization	(2,199,487)	$ (2,383,918)
Deferred finance fees, end	$ 11,846,890
Japanese Financings
Debt obligations
Total debt obligations			203,025,593		213,476,121
Corsair Japanese Financing
Debt obligations
Total debt obligations			44,958,333		47,395,833
Concorde Japanese Financing
Debt obligations
Total debt obligations			49,538,462		51,961,538
Corvette Japanese Financing
Debt obligations
Total debt obligations			50,076,923		52,500,000
CJNP Japanese Financing
Debt obligations
Total debt obligations			19,420,625		20,506,250
CMNL Japanese Financing
Debt obligations
Total debt obligations			18,418,899		19,446,131
CNML Japanese Financing
Debt obligations
Total debt obligations			20,612,351		21,666,369
2015 Debt Facility
Long-Term Debt
Original loan amount						$ 758,000,000
Minimum interest coverage ratio for following 9 month period (as a percent)				200.00%
Minimum interest coverage ratio for thereafter (as a percent)				250.00%
Minimum consolidated liquidity if interest coverage ratio of consolidated EBTDA is less than required				$ 47,500,000
Debt obligations
Total debt obligations			459,094,714		496,620,495
Commercial Financing
Debt obligations
Total debt obligations			166,461,402		175,687,613
KEXIM Direct Financing
Debt obligations
Total debt obligations			114,502,131		125,860,144
KEXIM Guaranteed
Debt obligations
Total debt obligations			119,130,446		130,366,568
K-sure Insured
Debt obligations
Total debt obligations			$ 59,000,735		$ 64,706,170

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