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Schedules of Investments (Unaudited) (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Investment [Table Text Block]
Description
  
Ounces
    
Cost
    
Fair Value
  
Silver bullion
    
333,046,831
     $
5,939,485,807
     $
4,764,234,916
  
                         
Total Investment – 100.04%
    
 
      
 
      
4,764,234,916
  
Less Liabilities – (0.04)%
    
 
      
 
      
(1,960,217
 )
Net Assets – 100.00%
    
 
      
 
     $
4,762,274,699
  
Description
  
Ounces
    
Cost
    
Fair Value
  
Silver bullion
    
320,629,662
     $
5,831,748,196
     $
5,407,419,250
  
                         
Total Investment – 100.04%
    
 
      
 
      
5,407,419,250
  
Less Liabilities – (0.04)%
    
 
      
 
      
(2,225,399
 )
Net Assets – 100.00%
    
 
      
 
     $
5,405,193,851