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Foreign Operations (Tables)
 3 Months Ended
Sep. 30, 2018
Foreign Currency [Abstract]  
Summary of foreign assets
    China   Latvia
    September 30, 2018   June 30, 2018   September 30, 2018   June 30, 2018
Assets    $14.9 million    $14.7 million    $7.0 million    $6.4 million
Net assets    $12.8 million    $12.6 million    $6.5 million    $5.9 million