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Employee Retirement Benefits (Details) - USD ($)
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Schedule Of Employee Retirement Benefits [Line Items]      
Contributions by the Company $ 269,928 $ 277,127 $ 279,968
Expiration Date of CBA May 31, 2021    
Surcharge Imposed   No