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Note 6 - Notes and Leases Payable (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2014
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Oct. 17, 2017
Oct. 17, 2016
Property, Plant and Equipment, Gross, Ending Balance   $ 9,255,537   $ 9,255,537   $ 9,255,537 $ 9,211,785    
Debt Instrument, Periodic Payment, Interest   705 $ 1,216 6,206 $ 2,743 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 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% 3.10%
Note Payable Insurance Company 2 [Member] | Maximum [Member]                  
Debt Instrument, Interest Rate, Stated Percentage               5.78% 5.78%
Mining Equipment [Member]                  
Property, Plant and Equipment, Gross, Ending Balance $ 65,120 $ 1,784,115   $ 1,784,115   $ 1,784,115 $ 1,775,884