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Note 2 - Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Activity in Silver Bullion [Table Text Block]
Three Months Ended March 31, 2018
 
Ounces
    
Average
Cost
    
Fair
Value
    
Realized
Gain (Loss)
  
Beginning balance
    
320,629,662
     $
5,831,748,196
     $
5,407,419,250
     $
—
  
Silver bullion contributed
    
10,935,451
      
182,901,133
      
182,901,133
      
—
  
Silver bullion distributed
    
(12,165,120
 )    
(221,157,658
 )    
(207,377,855
 )    
(13,779,803
 )
Silver bullion sold to pay expenses
    
(387,896
 )    
(7,049,370
 )    
(6,542,908
 )    
(506,462
 )
Net realized loss
    
—
      
—
      
(14,286,265
 )    
—
  
Net change in unrealized appreciation/depreciation
    
—
      
—
      
(168,596,426
 )    
—
  
Ending balance
    
319,012,097
     $
5,786,442,301
     $
5,193,516,929
     $
(14,286,265
 )
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
 )