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3. Warranty Reserve (Tables)
9 Months Ended
Mar. 31, 2018
Product Warranties Disclosures [Abstract]  
Schedule of warranty reserve
  

Nine Months Ended

March 31,

2018

  

Year Ended

June 30,

2017

 
   (In thousands) 
Beginning balance  $125   $138 
Charged to cost of revenue   138    65 
Usage   (150)   (78)
Ending balance  $113   $125