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Note 2 - Significant Accounting Policies - Activity in Silver Bullion (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
oz
Sep. 30, 2015
USD ($)
oz
Sep. 30, 2016
USD ($)
oz
Sep. 30, 2015
USD ($)
oz
Dec. 31, 2015
USD ($)
oz
Beginning balance (in Ounces) | oz 333,544,900 325,342,600 317,934,900 329,564,200 329,564,200
Beginning balance, average cost $ 6,140,793 $ 6,217,768 $ 5,979,252 $ 6,386,750 $ 6,386,750
Beginning balance, fair value $ 6,123,884 $ 5,107,880 $ 4,393,861 [1] $ 5,263,140 5,263,140
Silver bullion contributed (in Ounces) | oz 34,913,200 5,728,500 82,870,300 41,154,000  
Silver bullion contributed, average cost $ 684,685 $ 85,929 $ 1,446,755 $ 664,967  
Silver bullion contributed, fair value $ 684,685 $ 85,929 $ 1,446,755 $ 664,967  
Silver bullion distributed (in Ounces) | oz (5,697,000) (12,120,900) (37,237,200) (50,950,400)  
Silver bullion distributed, average cost $ (105,503) $ (231,025) $ (691,007) $ (963,268)  
Silver bullion distributed, fair value (109,479) (179,177) (619,584) (825,652)  
Silver bullion distributed, realized gain (loss) $ 3,976 $ (51,848) $ (71,423) $ (137,616)  
Silver bullion sold to pay expenses (in Ounces) | oz (421,000) (420,600) (1,227,900) (1,238,200)  
Silver bullion sold to pay expenses, average cost $ (7,779) $ (8,025) $ (22,804) $ (23,802)  
Silver bullion sold to pay expenses, fair value (8,186) (6,312) (20,576) (19,777)  
Silver bullion sold to pay expenses, realized gain (loss) 407 (1,713) (2,228) (4,025)  
Net realized gain (loss), fair value 4,383 (53,561) (73,651) (141,641) (212,156)
Net change in unrealized appreciation/depreciation, fair value $ 315,993 $ (288,300) $ 1,884,475 $ (274,578) $ (461,781)
Ending balance (in Ounces) | oz 362,340,100 318,529,600 362,340,100 318,529,600 317,934,900
Ending balance, average cost $ 6,712,196 $ 6,064,647 $ 6,712,196 $ 6,064,647 $ 5,979,252
Ending balance, fair value 7,011,280 [1] 4,666,459 7,011,280 [1] 4,666,459 4,393,861 [1]
Ending balance, realized gain (loss) $ 4,383 $ (53,561) $ (73,651) $ (141,641) $ (212,156)
[1] Cost of investment in silver bullion: $6,712,196 and $5,979,252, respectively.