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Foreign Operations (Tables)
 3 Months Ended
Sep. 30, 2020
Foreign Currency [Abstract]  
Foreign assets
  China Latvia
  September 30, 2020 June 30, 2020 September 30, 2020 June 30, 2020
Assets  $19.4 million  $19.0 million  $10.2 million  $9.8 million
Net assets  $16.6 million  $16.2 million  $8.8 million  $8.2 million