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Foreign Operations (Details) - USD ($)	Dec. 31, 2018	Jun. 30, 2018
CHINA
Assets in foreign locations	$ 15,900,000	$ 14,700,000
Net assets in foreign locations	13,700,000	12,600,000
LATVIA
Assets in foreign locations	7,100,000	6,400,000
Net assets in foreign locations	$ 6,500,000	$ 5,900,000

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