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Foreign Operations (Tables)
 9 Months Ended
Mar. 31, 2019
Foreign Currency [Abstract]  
Summary of foreign assets
    China Latvia
    March 31, 2019 June 30, 2018 March 31, 2019 June 30, 2018
Assets    $16.4 million  $14.7 million  $7.9 million  $6.4 million
Net assets    $14.0 million  $12.6 million  $7.2 million  $5.9 million