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Note 2 - Significant Accounting Policies - Activity in Silver Bullion (Details)
 12 Months Ended
Dec. 31, 2025
USD ($)
oz
Dec. 31, 2024
USD ($)
oz
Dec. 31, 2023
USD ($)
oz
Beginning balance (Ounce) | oz 463,837,932 436,892,231 466,265,146
Beginning balance, average cost $ 11,628,353,352 $ 9,616,427,847 $ 10,025,562,224
Beginning balance, fair value $ 13,407,235,411 [1] $ 10,393,666,180 $ 11,164,718,926
Silver bullion contributed (Ounce) | oz 373,938,415 268,075,875 153,556,215
Silver bullion contributed, average cost $ 15,615,761,735 $ 7,621,670,899 $ 3,580,116,083
Silver bullion contributed, fair value $ 15,615,761,735 $ 7,621,670,899 $ 3,580,116,083
Silver bullion distributed (Ounce) | oz (306,799,585) (238,913,180) (180,643,461)
Silver bullion distributed, average cost $ (8,651,662,301) $ (5,558,281,112) $ (3,939,416,144)
Silver bullion distributed, fair value (12,277,651,846) (6,775,130,565) (4,222,040,407)
Silver bullion distributed, realized gain (loss) $ 3,625,989,545 $ 1,216,849,453 $ 282,624,263
Silver bullion sold to pay expenses (Ounce) | oz (2,285,397) (2,216,994) (2,285,669)
Silver bullion sold to pay expenses, average cost $ (63,739,857) $ (51,464,282) $ (49,834,316)
Silver bullion sold to pay expenses, fair value (87,321,795) (61,784,640) (53,707,373)
Silver bullion sold to pay expenses, realized gain (loss) 23,564,605 10,181,575 3,873,057
Net realized gain (loss), fair value 3,649,554,150 1,227,031,028 286,497,320
Litigation proceeds [3] 17,333 [2] 138,783 [4] 0
Net change in unrealized appreciation/depreciation, fair value $ 17,752,896,409 $ 1,001,643,726 $ (361,918,369)
Ending balance (Ounce) | oz 528,691,365 463,837,932 436,892,231
Ending balance, average cost $ 18,528,712,929 $ 11,628,353,352 $ 9,616,427,847
Ending balance, fair value 38,060,491,397 [1] 13,407,235,411 [1] 10,393,666,180
Ending balance, realized gain (loss) $ 3,649,554,150 $ 1,227,031,028 $ 286,497,320
[1] Cost of investment in silver bullion: $18,528,712,929 and $11,628,353,352, respectively.
[2] Includes a payment received from a class action settlement related to silver of $17,333.
[3] Represents a payment received from a class action settlement related to silver.
[4] Includes a payment received from a class action settlement related to silver of $138,783.