Financial Instruments and Fair Value Disclosures (Details) - Interest rate swaps	Sep. 30, 2015 USD ($) item	Mar. 31, 2015 USD ($)
Derivatives not designated as hedging instruments | Long-term liabilities-Derivatives instruments
Derivative asset and liability
Liability derivatives	$ 16,455,007	$ 12,730,462
RBS
Derivative asset and liability
Number of interest rate swaps | item	5
Citibank N.A.
Derivative asset and liability
Notional amount of hedge	$ 200,000,000
Fixed interest rate (as a percent)	1.93%
ING Bank N. V. Member
Derivative asset and liability
Notional amount of hedge	$ 50,000,000
Fixed interest rate (as a percent)	2.00%