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Foreign Operations (Tables)
 12 Months Ended
Jun. 30, 2019
Foreign Currency [Abstract]  
Assets and net assets in foreign countries
    China     Latvia  
    June 30, 2019     June 30, 2018     June 30, 2019     June 30, 2018  
Assets   $ 16.9 million     $ 14.7 million     $ 8.2 million     $ 6.4 million  
Net assets   $ 14.5 million     $ 12.6 million     $ 7.8 million     $ 5.9 million