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Note 2 - Significant Accounting Policies - Activity in Silver Bullion (Details)
 12 Months Ended
Dec. 31, 2023
USD ($)
oz
Dec. 31, 2022
USD ($)
oz
Dec. 31, 2021
USD ($)
oz
Beginning balance (Ounce) | oz 466,265,146 530,838,100 558,715,882
Beginning balance, average cost $ 10,025,562,224 $ 11,330,688,133 $ 10,472,474,303
Beginning balance, fair value $ 11,164,718,926 [1] $ 12,254,397,545 $ 14,797,590,146
Silver bullion contributed (Ounce) | oz 153,556,215 162,289,256 256,106,607
Silver bullion contributed, average cost $ 3,580,116,083 $ 3,608,993,778 $ 6,742,609,430
Silver bullion contributed, fair value $ 3,580,116,083 $ 3,608,993,778 $ 6,742,609,430
Silver bullion distributed (Ounce) | oz (180,643,461) (224,224,243) (281,173,891)
Silver bullion distributed, average cost $ (3,939,416,144) $ (4,857,116,435) $ (5,825,814,648)
Silver bullion distributed, fair value (4,222,040,407) (4,680,125,800) (7,174,837,696)
Silver bullion distributed, realized gain (loss) $ 282,624,263 $ (176,990,635) $ 1,349,023,048
Silver bullion sold to pay expenses (Ounce) | oz (2,285,669) (2,637,967) (2,810,498)
Silver bullion sold to pay expenses, average cost $ (49,834,316) $ (57,003,252) $ (58,580,952)
Silver bullion sold to pay expenses, fair value (53,707,373) (56,964,663) (71,843,069)
Silver bullion sold to pay expenses, realized gain (loss) 3,873,057 (38,589) 13,262,117
Net realized gain (loss), fair value 286,497,320 (177,029,224) 1,362,285,165
Net change in unrealized appreciation/depreciation, fair value $ (361,918,369) $ 215,447,290 $ (3,401,406,431)
Ending balance (Ounce) | oz 436,892,231 466,265,146 530,838,100
Ending balance, average cost $ 9,616,427,847 $ 10,025,562,224 $ 11,330,688,133
Ending balance, fair value 10,393,666,180 [1] 11,164,718,926 [1] 12,254,397,545
Ending balance, realized gain (loss) $ 286,497,320 $ (177,029,224) $ 1,362,285,165
[1] Cost of investment in silver bullion: $9,616,427,847 and $10,025,562,224, respectively.