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Property, Plant and Equipment - Narrative (Details) - USD ($)
3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Property, Plant and Equipment [Line Items]      
Historical cost $ 3,285,000 $ 2,122,000  
Net book value 41,527,000   $ 40,845,000
Depreciation and amortization 1,863,000 1,730,000  
Disposal Group, Not Discontinued Operations      
Property, Plant and Equipment [Line Items]      
Net book value $ 0 $ 0