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Foreign Operations (Tables)
 3 Months Ended
Sep. 30, 2019
Foreign Currency [Abstract]  
Summary of foreign assets
    China   Latvia
    September 30, 2019   June 30, 2019   September 30, 2019   June 30, 2019
Assets    $17.4 million    $16.9 million    $9.1 million    $8.2 million
Net assets    $14.9 million    $14.5 million    $8.0 million    $7.8 million