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Fair Value Disclosures - Assets and liabilities recorded at fair value on recurring basis (Details) - Recurring Basis - USD ($)
Sep. 30, 2015
Mar. 31, 2015
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap agreements - liability $ 0 $ 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap agreements - liability (303,403) (180,775)
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap agreements - liability 0 0
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap agreements - liability $ (303,403) $ (180,775)