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Note 2 - Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Activity in Silver Bullion [Table Text Block]
Three Months Ended September 30, 2018
  
Ounces
    

Cost
    
Fair
Value
    
Realized
Gain (Loss)
  
Beginning balance
    
322,465,714
     $
5,806,008,238
     $
5,169,125,403
     $
—
  
Silver bullion contributed
    
19,467,176
      
292,541,629
      
292,541,629
      
—
  
Silver bullion distributed
    
(8,462,245
 )    
(151,456,941
 )    
(126,949,317
 )    
(24,507,624
 )
Silver bullion sold to pay expenses
    
(423,814
 )    
(7,607,119
 )    
(6,446,950
 )    
(1,160,169
 )
Net realized loss
    
—
      
—
      
(25,667,793
 )    
—
  
Net change in unrealized appreciation/depreciation
    
—
      
—
      
(538,368,056
 )    
—
  
Ending balance
    
333,046,831
     $
5,939,485,807
     $
4,764,234,916
     $
(25,667,793
 )
Three Months Ended September 30, 2017
  
Ounces
    

Cost
    
Fair
Value
    
Realized
Gain (Loss)
  
Beginning balance
    
339,605,211
     $
6,235,001,418
     $
5,593,297,824
     $
—
  
Silver bullion contributed
    
11,392,577
      
180,668,658
      
180,668,658
      
—
  
Silver bullion distributed
    
(23,817,516
 )    
(435,509,224
 )    
(403,286,795
 )    
(32,222,429
 )
Silver bullion sold to pay expenses
    
(422,857
 )    
(7,742,714
 )    
(7,146,128
 )    
(596,586
 )
Net realized loss
    
—
      
—
      
(32,819,015
 )    
—
  
Net change in unrealized appreciation/depreciation
    
—
      
—
      
178,415,473
      
—
  
Ending balance
    
326,757,415
     $
5,972,418,138
     $
5,509,130,017
     $
(32,819,015
 )
Nine Months Ended September 30, 2018
 
Ounces
    

Cost
    
Fair
Value
    
Realized
Gain (Loss)
  
Beginning balance
    
320,629,662
     $
5,831,748,196
     $
5,407,419,250
     $
—
  
Silver bullion contributed
    
55,163,280
      
880,252,487
      
880,252,487
      
—
  
Silver bullion distributed
    
(41,529,029
 )    
(750,523,168
 )    
(684,717,667
 )    
(65,805,501
 )
Silver bullion sold to pay expenses
    
(1,217,082
 )    
(21,991,708
 )    
(19,636,834
 )    
(2,354,874
 )
Net realized loss
    
—
      
—
      
(68,160,375
 )    
—
  
Net change in unrealized appreciation/depreciation
    
—
      
—
      
(750,921,945
 )    
—
  
Ending balance
    
333,046,831
     $
5,939,485,807
     $
4,764,234,916
     $
(68,160,375
 )
Nine Months Ended September 30, 2017
 
Ounces
    

Cost
    
Fair
Value
    
Realized
Gain (Loss)
  
Beginning balance
    
341,348,242
     $
6,305,715,839
     $
5,543,495,441
     $
—
  
Silver bullion contributed
    
38,888,176
      
649,149,108
      
649,149,108
      
—
  
Silver bullion distributed
    
(52,224,977
 )    
(959,371,591
 )    
(899,979,662
 )    
(59,391,929
 )
Silver bullion sold to pay expenses
    
(1,254,026
 )    
(23,075,218
 )    
(21,537,444
 )    
(1,537,774
 )
Net realized loss
    
—
      
—
      
(60,929,703
 )    
—
  
Net change in unrealized appreciation/depreciation
    
—
      
—
      
298,932,277
      
—
  
Ending balance
    
326,757,415
     $
5,972,418,138
     $
5,509,130,017
     $
(60,929,703
 )