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PRODUCT WARRANTY OBLIGATIONS (Details) - USD ($)
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance, beginning of year $ 483,530 $ 531,891
Provision charged to expense 159,990 214,827
Warranty expenses incurred (258,561) (263,188)
Balance, end of year $ 384,959 $ 483,530