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Fair Value Disclosures - Assets and liabilities recorded at fair value on recurring basis (Details) (Recurring Basis, USD $)
Mar. 31, 2013
Aug. 13, 2012
Jun. 13, 2012
Level 1
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest rate swap agreements         
Level 2
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest rate swap agreements (504,852) (56,454) 135,245
Level 3
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest rate swap agreements         
Fair Value
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest rate swap agreements $ (504,852) $ (56,454) $ 135,245