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Foreign Operations (Details) - USD ($)
3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Gain (loss) on foreign currency $ (338,000) $ (246,000)  
Foreign currency translation adjustment 173,047 $ 54,147  
CHINA      
Assets in foreign locations 14,900,000   $ 14,700,000
Net assets in foreign locations 12,800,000   12,600,000
LATVIA      
Assets in foreign locations 7,000,000   6,400,000
Net assets in foreign locations $ 6,500,000   $ 5,900,000