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Note 2 - Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Activity in Silver Bullion [Table Text Block]
Three Months Ended March 31, 2017
 
Ounces
 
 
Average
Cost
 
 
Fair
Value
 
 
Realized
Gain (Loss)
 
Beginning balance
    
341,348,242
     $
6,305,715,839
     $
5,543,495,441
     $
—
  
Silver bullion contributed
    
4,830,754
      
84,171,380
      
84,171,380
      
—
  
Silver bullion distributed
    
(15,443,140
 )    
(285,204,911
 )    
(269,671,252
 )    
(15,533,659
 )
Silver bullion sold to pay expenses
    
(409,659
 )    
(7,566,576
 )    
(7,056,499
 )    
(510,077
 )
Net realized loss
    
—
      
—
      
(16,043,736
 )    
—
  
Net change in unrealized appreciation/depreciation
    
—
      
—
      
630,795,770
      
—
  
Ending balance
    
330,326,197
     $
6,097,115,732
     $
5,965,691,104
     $
(16,043,736
 )
Three Months Ended March 31, 2016
 
Ounces
 
 
Average
Cost
 
 
Fair
Value
 
 
Realized
Gain (Loss)
 
Beginning balance
    
317,934,907
     $
5,979,251,955
     $
4,393,860,514
     $
—
  
Silver bullion contributed
    
26,987,106
      
412,201,487
      
412,201,487
      
—
  
Silver bullion distributed
    
(11,952,590
 )    
(224,382,205
 )    
(172,985,000
 )    
(51,397,205
 )
Silver bullion sold to pay expenses
    
(390,915
 )    
(7,341,829
 )    
(5,638,637
 )    
(1,703,192
 )
Net realized loss
    
—
      
—
      
(53,100,397
 )    
—
  
Net change in unrealized appreciation/depreciation
    
—
      
—
      
540,719,490
      
—
  
Ending balance
    
332,578,508
     $
6,159,729,408
     $
5,115,057,457
     $
(53,100,397
 )