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Note 7 - Notes and Leases Payable (Details Textual) - USD ($)
12 Months Ended
Oct. 31, 2014
Sep. 20, 2012
Dec. 31, 2017
Dec. 31, 2016
Oct. 17, 2016
Property, Plant and Equipment, Gross, Ending Balance     $ 9,255,537 $ 9,211,785  
Debt Instrument, Periodic Payment, Interest     6,365 4,956  
Note Payable, Mining Equipment, Purchased in October 2014 [Member]          
Debt Instrument, Face Amount $ 57,900        
Debt Instrument, Interest Rate, Stated Percentage 5.20%        
Debt Instrument, Periodic Payment, Total $ 1,339        
Debt Instrument, Term 4 years        
Note Payable Mining Site Vehicle [Member]          
Debt Instrument, Face Amount   $ 37,701      
Debt Instrument, Periodic Payment, Total   $ 628 628 628  
Debt Instrument, Term   5 years      
Note Payable Insurance Company 1 [Member] | Minimum [Member]          
Debt Instrument, Interest Rate, Stated Percentage         2.60%
Note Payable Insurance Company 1 [Member] | Maximum [Member]          
Debt Instrument, Interest Rate, Stated Percentage         4.15%
Note Payable Insurance Company 2 [Member] | Minimum [Member]          
Debt Instrument, Interest Rate, Stated Percentage         3.10%
Note Payable Insurance Company 2 [Member] | Maximum [Member]          
Debt Instrument, Interest Rate, Stated Percentage         5.78%
Mining Equipment [Member]          
Property, Plant and Equipment, Gross, Ending Balance $ 65,120   $ 1,784,115 $ 1,775,884