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3. Warranty Reserve (Tables)
9 Months Ended
Mar. 31, 2017
Product Warranties Disclosures [Abstract]  
Schedule of warranty reserve
   Nine Months Ended   Year Ended 
   March 31,   June 30, 
   2017   2016 
   (In thousands) 
Beginning balance  $138   $163 
Charged to cost of revenue   34    91 
Usage   (56)   (116)
Ending balance  $116   $138