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Derivatives and Financial Instruments (Details) (Interest Rate Swap Agreements, USD $)
Sep. 30, 2014
Mar. 31, 2014
Derivative asset and liability    
Number of interest rate swaps 5  
Derivatives not designated as hedging instruments | Long-term liabilities-Derivatives instruments
   
Derivative asset and liability    
Liability derivatives $ 12,405,364 $ 14,062,416