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Note 4 - Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Property, Plant, And Equipment, Carrying Value [Table Text Block]
    December 31,  
   
201
7
    
201
6
  
Land
   $
500,000
     $
500,000
  
Land improvements
    
171,122
      
171,122
  
Buildings
    
3,129,519
      
3,129,519
  
Mining equipment
    
1,784,115
      
1,775,884
  
Milling equipment
    
2,841,726
      
2,806,834
  
Laboratory equipment
    
607,716
      
607,716
  
Office equipment
    
70,529
      
69,900
  
Vehicles
    
150,810
      
150,810
  
     
9,255,537
      
9,211,785
  
Less: Accumulated depreciation
    
(6,453,146
 )    
(5,136,609
 )
Total
   $
2,802,391
     $
4,075,176