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Foreign Operations (Tables)
 12 Months Ended
Jun. 30, 2020
Foreign Currency [Abstract]  
Assets and net assets in foreign countries
    China   Latvia
    June 30, 2020   June 30, 2019   June 30, 2020   June 30, 2019
Assets    $19.0 million    $16.9 million    $9.8 million    $8.2 million
Net assets    $16.2 million    $14.5 million    $8.2 million    $7.8 million