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Note 2 - Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2014
Accounting Policies [Abstract] |
Schedule of Stockholders Equity [Table Text Block] |
|  | Balance at December 31, 2013 |  |  | ASU 2013-08 Transition Adjustment |  |  | Balance at January 1, 2014 |
Redeemable capital Shares |  | $ | 6,240,747 |  |  | $ | (6,240,747 | ) |  | $ | — |
Shareholders’ equity |  |  | — |  |  |  | 6,240,747 |  |  |  | 6,240,747 |
Activity in Silver Bullion [Table Text Block] |
|  | Ounces |  |  | Average Cost |  |  | Fair Value |  |  | Realized Gain (Loss) |
Beginning balance |  |  | 322,872.9 |  |  | $ | 6,310,696 |  |  | $ | 6,738,358 |  |  | $ | — |
Silver bullion contributed |  |  | 30,743.4 |  |  |  | 581,957 |  |  |  | 581,957 |  |  |  | — |
Silver bullion distributed |  |  | (3,118.6 | ) |  |  | (60,967 | ) |  |  | (62,616 | ) |  |  | 1,649 |
Silver bullion sold |  |  | (411.3 | ) |  |  | (8,041 | ) |  |  | (8,297 | ) |  |  | 256 |
Net realized gain on silver bullion |  |  | — |  |  |  | — |  |  |  | 1,905 |  |  |  | — |
Net change in unrealized appreciation/depreciation on investment in silver bullion |  |  | — |  |  |  | — |  |  |  | (1,261,329 | ) |  |  | — |
Ending balance |  |  | 350,086.4 |  |  | $ | 6,823,645 |  |  | $ | 5,989,978 |  |  | $ | 1,905 |
|  | Ounces |  |  | Average Cost |  |  | Fair Value |  |  | Realized Gain (Loss) |
Beginning balance |  |  | 320,177.8 |  |  | $ | 6,243,467 |  |  | $ | 6,243,467 |  |  | $ | — |
Silver bullion contributed |  |  | 60,841.0 |  |  |  | 1,184,514 |  |  |  | 1,184,514 |  |  |  | — |
Silver bullion distributed |  |  | (29,693.0 | ) |  |  | (580,118 | ) |  |  | (597,071 | ) |  |  | 16,953 |
Silver bullion sold |  |  | (1,239.4 | ) |  |  | (24,218 | ) |  |  | (24,582 | ) |  |  | 364 |
Net realized gain on silver bullion |  |  | — |  |  |  | — |  |  |  | 17,317 |  |  |  | — |
Net change in unrealized appreciation/depreciation on investment in silver bullion |  |  | — |  |  |  | — |  |  |  | (833,667 | ) |  |  | — |
Ending balance |  |  | 350,086.4 |  |  | $ | 6,823,645 |  |  | $ | 5,989,978 |  |  | $ | 17,317 |
|  | Ounces |  |  | Average Cost |  |  | Fair Value |  |  | Realized Gain (Loss) |
Beginning balance |  |  | 318,481.3 |  |  | $ | 6,006,558 |  |  | $ | 6,006,558 |  |  | $ | — |
Silver contributed |  |  | 29,225.5 |  |  |  | 601,985 |  |  |  | 601,985 |  |  |  | — |
Silver distributed |  |  | (5,544.4 | ) |  |  | (139,664 | ) |  |  | (124,455 | ) |  |  | (15,209 | )
Silver sold |  |  | (411.1 | ) |  |  | (10,397 | ) |  |  | (8,642 | ) |  |  | (1,755 | )
Adjustment to silver bullion inventory(a) |  |  | — |  |  |  | 950,686 |  |  |  | — |  |  |  | — |
Adjustment for realized loss |  |  | — |  |  |  | — |  |  |  | (16,964 | ) |  |  | — |
Adjustment for unrealized gain on silver bullion |  |  | — |  |  |  | — |  |  |  | 950,686 |  |  |  | — |
Ending balance |  |  | 341,751.3 |  |  | $ | 7,409,168 |  |  | $ | 7,409,168 |  |  | $ | (16,964 | )
|  | Ounces |  |  | Average Cost |  |  | Fair Value |  |  | Realized Gain (Loss) |
Beginning balance |  |  | 324,239.1 |  |  | $ | 8,135,003 |  |  | $ | 9,710,962 |  |  | $ | — |
Silver contributed |  |  | 78,089.7 |  |  |  | 1,992,277 |  |  |  | 1,992,277 |  |  |  | — |
Silver distributed |  |  | (59,304.6 | ) |  |  | (1,514,965 | ) |  |  | (1,501,375 | ) |  |  | (13,590 | )
Silver sold |  |  | (1,272.9 | ) |  |  | (32,389 | ) |  |  | (32,245 | ) |  |  | (144 | )
Adjustment to silver bullion inventory(b) |  |  | — |  |  |  | (1,170,758 | ) |  |  | — |  |  |  | — |
Adjustment for realized loss |  |  | — |  |  |  | — |  |  |  | (13,734 | ) |  |  | — |
Adjustment for unrealized loss on silver bullion |  |  | — |  |  |  | — |  |  |  | (2,746,717 | ) |  |  | — |
Ending balance |  |  | 341,751.3 |  |  | $ | 7,409,168 |  |  | $ | 7,409,168 |  |  | $ | (13,734 | )
Schedule of Capital Units [Table Text Block] |
|  | Nine Months Ended September 30, 2014 |
|  | Shares |  |  | Amount |
Shares issued |  |  | 63,350 |  |  | $ | 1,184,514 |
Shares redeemed |  |  | (30,900 | ) |  |  | (597,071 | )
Net increase |  |  | 32,450 |  |  | $ | 587,443 |
Temporary Equity [Table Text Block] |
|  | Year Ended December 31, 2013 |
|  | Shares |  |  | Amount |
Beginning balance |  |  | 335,000 |  |  | $ | 9,706,654 |
Shares issued |  |  | 85,750 |  |  |  | 2,096,484 |
Shares redeemed |  |  | (88,250 | ) |  |  | (2,031,644 | )
Redemption value adjustment |  |  | — |  |  |  | (3,530,747 | )
Ending balance |  |  | 332,500 |  |  | $ | 6,240,747 |

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