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Note 6 - Notes and Leases Payable (Tables)
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Notes Tables    
Schedule of Debt [Table Text Block]
   
June 30,
    
December 31,
  
   
2018
    
2017
  
                 
Note payable for equipment, payable $1,339 monthly, including interest (a)
   $
6,605
     $
13,073
  
Note payable to insurance companies, payable $5,045 - $17,959 monthly, (b) and (c)
    
59,810
      
199,061
  
     
66.415
      
212,134
  
Less: Current Portion
    
(66,415
)
    
(212,134
)
Notes Payable, Long-Term Portion
   $
- 0 -
     $
- 0 -
  
   
December 31,
  
   
2017
    
2016
  
                 
Note payable for equipment, payable $1,339 monthly, including interest (a)
   $
13,073
     $
28,033
  
Note payable for mine site vehicle, payable $628 monthly (b)
    
- 0 -
      
5,655
  
Note payable to insurance companies, payable $5,045 - $17,959 monthly, (c) and (d)
    
199,061
      
213,534
  
     
212,134
      
247,222
  
Less: Current Portion
    
(212,134
)
    
(234,149
)
Notes Payable, Long-Term Portion
   $
- 0 -
     $
13,073