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4. Inventories
12 Months Ended
Jun. 30, 2016
Inventory Disclosure [Abstract]  
Inventories
     2016       2015   
             
Raw materials   $ 1,529,800     $ 1,420,800  
Work-in-process     425,300       442,900  
Finished goods     457,000       350,000  
                 
    $ 2,412,100     $ 2,213,700