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Note 9 - Related Party Transactions (Details Textual) - USD ($)
Nov. 20, 2019
Oct. 23, 2017
Mar. 31, 2020
Aug. 02, 2019
Apr. 26, 2018
Apr. 16, 2018
Sep. 30, 2012
Nov. 29, 2010
Long-term Debt, Total     $ 0          
The Joint Venture Company [Member]                
Equity Method Investment, Ownership Percentage     60.00%   60.00%      
JEX [Member]                
Overriding Royalty Interest     3.00%       2.00%  
Management Services Agreement, Fee Per Month $ 47,000              
JEX [Member] | Expense for Office Space and Equipment [Member]                
Management Services Agreement, Fee Per Month $ 6,900              
JEX [Member] | ALASKA                
Overriding Royalty Interest             2.00%  
Juneau Exploration L.P. [Member] | Private Placement [Member]                
Stock Issued During Period, Shares, New Issues (in shares)   13,200            
Stock Issued During Period, Value, New Issues   $ 250,800            
Royal Gold [Member]                
Overriding Royalty Interest               3.00%
Royal Gold [Member] | Common Stock [Member]                
Percentage of Ownership Interest Acquired by Related Party       12.70%   13.60%    
Shares Issued, Price Per Share (in dollars per share)           $ 26