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Inventories, net (Tables)
3 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Inventories
   September 30, 2020  June 30, 2020
   (unaudited)          
   (in thousands)
Raw materials  $1,085   $992 
Work in process   270    234 
Finished goods   972    900 
 Total inventories   2,327    2,126 
Allowance for inventory reserves   (141)   (141)
Total inventories, net of allowance  $2,186   $1,985