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Note 6 - Notes and Leases Payable (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Oct. 31, 2014
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Oct. 17, 2017
Oct. 17, 2016
Property, Plant and Equipment, Gross, Ending Balance   $ 9,255,537   $ 9,255,537   $ 9,255,537    
Debt Instrument, Periodic Payment, Interest   705 $ 1,216 6,206 $ 2,743      
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%  
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   $ 1,784,115   $ 1,784,115