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Foreign Operations (Tables)
 9 Months Ended
Mar. 31, 2021
Foreign Currency [Abstract]  
Foreign assets
    China   Latvia
    March 31, 2021   June 30, 2020   March 31, 2021   June 30, 2020
Assets    $21.5 million    $19.0 million    $10.6 million    $9.8 million
Net assets    $18.1 million    $16.2 million    $8.5 million    $8.2 million