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Note 4 - Property and Equipment (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Property, Plant, And Equipment, Carrying Value [Table Text Block]
   
March 31,
    
December 31,
  
   
2018
    
2017
  
Land
   $
500,000
     $
500,000
  
Land improvements
    
171,122
      
171,122
  
Buildings
    
3,129,519
      
3,129,519
  
Mining equipment
    
1,784,115
      
1,784,115
  
Milling equipment
    
2,841,726
      
2,841,726
  
Laboratory equipment
    
607,716
      
607,716
  
Office equipment
    
70,529
      
70,529
  
Vehicles
    
150,810
      
150,810
  
     
9,255,537
      
9,255,537
  
Less: Accumulated depreciation
    
(6,776,290
)
    
(6,453,146
)
Total
   $
2,479,247
     $
2,802,391