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Note 2 - Summary of Significant Accounting Policies (Details) - Activity in Silver Bullion (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
oz
Jun. 30, 2013
oz
Jun. 30, 2014
oz
Jun. 30, 2013
oz
Activity in Silver Bullion [Abstract]        
Beginning balance (in Ounces) 328,342,100 344,128,500 320,177,800 324,239,100
Beginning balance, average cost $ 6,420,930   $ 6,243,467  
Beginning balance, fair value 6,556,992   6,243,467  
Silver contributed (in Ounces) 11,434,500 11,633,500 30,097,600 48,864,200
Silver contributed, average cost 220,207 254,624 602,557 1,390,292
Silver contributed, fair value 220,207 254,624 602,557 1,390,292
Silver distributed (in Ounces) (16,472,500) (36,838,500) (26,574,400) (53,760,200)
Silver distributed, average cost (322,012) (943,933) (519,151) (1,375,301)
Silver distributed, fair value (327,566) (852,262) (534,455) (1,376,920)
Silver distributed, realized gain (loss) 5,554 (91,671) 15,304 1,619
Silver sold (in Ounces) (431,200) (442,200) (828,100) (861,800)
Silver sold, average cost (8,429) (11,339) (16,177) (21,992)
Silver sold, fair value (8,282) (10,976) (16,285) (23,603)
Silver sold, realized gain (loss) (147) (363) 108 1,611
Adjustment to silver bullion inventory   (2,121,444) [1]    [2] (2,121,444) [1],[2]
Adjustment for realized loss   (92,034)   3,230
Adjustment for unrealized loss on silver bullion   (3,148,634)   (3,697,403)
Ending balance (in Ounces) 322,872,900 [3] 318,481,300 322,872,900 [3] 318,481,300
Ending balance, average cost   6,006,558   6,006,558
Ending balance, fair value   6,006,558   6,006,558
Ending balance, realized gain (loss)   (92,034)   3,230
Adjustment for realized gain (loss), fair value 5,407   15,412  
Adjustment for unrealized loss on silver, fair value 291,600   427,662  
Ending balance, average cost 6,310,696 [3]   6,310,696 [3]  
Ending balance, fair value 6,738,358 [3],[4]   6,738,358 [3],[4]  
Ending balance, realized gain (loss) 5,407   15,412  
Beginning balance, average cost   8,828,650   8,135,003
Beginning balance, fair value   $ 9,855,840 $ 6,243,467 $ 9,710,962
[1] Previously reported as "market value reserve."
[2] Previously reported as "market value reserve." Please refer to Note 2C for accounting policy.
[3] Effective January 1, 2014, the Trust qualifies as an investment company for accounting purposes. Disclosure of a schedule of investments is required for investment companies. Please refer to Note 2B.
[4] Presented at fair value at June 30, 2014 (cost: $6,310,696)