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Note 8 - Investment in Peak Gold, LLC - Roll-forward of Investment in the Joint Venture Company (Details) - USD ($)
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Investment balance            
Investment in Peak Gold, LLC 3,861,252 $ 3,720,000          
Loss from equity investment in Peak Gold, LLC (3,861,252) (3,720,000)          
Investment balance          
The Joint Venture Company [Member]              
Investment balance 0
Investment in Peak Gold, LLC 3,861,252 3,720,000 4,140,000 2,580,000 1,433,886
Loss from equity investment in Peak Gold, LLC (3,861,252) (3,720,000) (4,140,000) (2,580,000) (1,433,886)
Investment balance $ 0 $ 0