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Organization and Business Invesment in Joint Venture Company (Details)
12 Months Ended 18 Months Ended
Jun. 30, 2016
USD ($)
Rate
Jun. 30, 2016
USD ($)
Rate
Property Subject to or Available for Operating Lease [Line Items]    
Investment by Joint Venture Partner | $ $ 5,650,000 $ 10,700,000
Royal Alaska Joint Venture Percentage | Rate 11.00% 11.00%