Financial Instruments and Fair Value Disclosures (Details) - Interest rate swaps	Dec. 31, 2015 USD ($) item	Oct. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)
Derivatives not designated as hedging instruments | Other non-current assets-Derivative instruments
Derivative asset and liability
Derivative Asset	$ 1,869,068
Derivatives not designated as hedging instruments | Long-term liabilities-Derivatives instruments
Derivative asset and liability
Liability derivatives	$ 10,934,205			$ 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		$ 128,600,000	$ 200,000,000
Fixed interest rate (as a percent)		1.38%	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%
CBA
Derivative asset and liability
Notional amount of hedge		$ 85,700,000
Fixed interest rate (as a percent)		1.43%