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Commitments and Contingencies (Details Textual) - USD ($)
6 Months Ended
Dec. 31, 2017
Jul. 02, 2017
Commitments And Contingencies Disclosure [Abstract]    
Environmental reserve originally established in 1995 $ 3,000,000  
Environmental 1,296,000 $ 1,308,000
Cost incurred inception to date on installation and on-going monitoring of wells $ 580,000