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Note 2 - Significant Accounting Policies - Activity in Silver Bullion (Details)
 12 Months Ended
Dec. 31, 2022
USD ($)
oz
Dec. 31, 2021
USD ($)
oz
Dec. 31, 2020
USD ($)
oz
Beginning balance (Ounce) | oz 530,838,100 558,715,882 362,616,711
Beginning balance, average cost $ 11,330,688,133 $ 10,472,474,303 $ 6,294,157,046
Beginning balance, fair value $ 12,254,397,545 [1] $ 14,797,590,146 $ 6,543,418,555
Silver bullion contributed (Ounce) | oz 162,289,256 256,106,607 371,438,229
Silver bullion contributed, average cost $ 3,608,993,778 $ 6,742,609,430 $ 7,299,222,832
Silver bullion contributed, fair value $ 3,608,993,778 $ 6,742,609,430 $ 7,299,222,832
Silver bullion distributed (Ounce) | oz (224,224,243) (281,173,891) (173,055,462)
Silver bullion distributed, average cost $ (4,857,116,435) $ (5,825,814,648) $ (3,080,813,670)
Silver bullion distributed, fair value (4,680,125,800) (7,174,837,696) (4,002,727,459)
Silver bullion distributed, realized gain (loss) $ (176,990,635) $ 1,349,023,048 $ 921,913,789
Silver bullion sold to pay expenses (Ounce) | oz (2,637,967) (2,810,498) (2,283,596)
Silver bullion sold to pay expenses, average cost $ (57,003,252) $ (58,580,952) $ (40,091,905)
Silver bullion sold to pay expenses, fair value (56,964,663) (71,843,069) (47,505,972)
Silver bullion sold to pay expenses, realized gain (loss) (38,589) 13,262,117 7,414,067
Net realized gain (loss), fair value (177,029,224) 1,362,285,165 929,327,856
Net change in unrealized appreciation/depreciation, fair value $ 215,447,290 $ (3,401,406,431) $ 4,075,854,334
Ending balance (Ounce) | oz 466,265,146 530,838,100 558,715,882
Ending balance, average cost $ 10,025,562,224 $ 11,330,688,133 $ 10,472,474,303
Ending balance, fair value 11,164,718,926 [1] 12,254,397,545 [1] 14,797,590,146
Ending balance, realized gain (loss) $ (177,029,224) $ 1,362,285,165 $ 929,327,856
[1] Cost of investment in silver bullion: $10,025,562,224 and $11,330,688,133, respectively.