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Note 3 - Property, Plant and Equipment (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
September
30,
2017
    
December 31,
2016
  
                 
Plant and equipment
   $
36,764,824
     $
19,201,550
  
Construction in process
    
47,984,431
      
11,847,904
  
Capitalized mine development costs
    
19,848,745
      
15,635,956
  
Less: accumulated depreciation, depletion and amortization
    
(1,586,667
 )    
(251,684
 )
Total property, plant and equipment, net
   $
103,011,333
     $
46,433,726