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Note 4 - Investment in the Joint Venture Company - Roll-forward of Investment in the Joint Venture Company (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Investment balance              
Investment in Peak Gold, LLC     2,790,000        
Loss from equity investment in Peak Gold, LLC $ (840,000) (2,790,000)        
Investment balance          
The Joint Venture Company [Member]                
Investment balance     0 $ 0 0 $ 0 $ 0 $ 0
Investment in Peak Gold, LLC     2,790,000   2,580,000 0 0 1,433,886
Loss from equity investment in Peak Gold, LLC     (2,790,000)   (2,580,000) 0 0 (1,433,886)
Investment balance $ 0   $ 0   $ 0 $ 0 $ 0 $ 0