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5. Inventories (Tables)
6 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Inventories
    December 31, 2018    

June 30,

2018

 
             
Raw materials   $ 1,554,000     $ 1,488,000  
Work-in-process     555,300       352,700  
Finished goods     614,600       427,200  
                 
    $ 2,723,900     $ 2,267,900