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Employee Retirement Benefits (Details) - USD ($)
12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Schedule Of Employee Retirement Benefits [Line Items]      
Contributions by the Company $ 279,968 $ 287,385 $ 293,377
Expiration Date of CBA May 31, 2018    
Surcharge Imposed No