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Note 2 - Significant Accounting Policies - Activity in Silver Bullion (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
oz
Jun. 30, 2020
USD ($)
oz
Mar. 31, 2020
USD ($)
oz
Sep. 30, 2019
USD ($)
oz
Jun. 30, 2019
USD ($)
oz
Mar. 31, 2019
USD ($)
oz
Sep. 30, 2020
USD ($)
oz
Sep. 30, 2019
USD ($)
oz
Beginning balance (Ounce) | oz 498,007,498   362,616,711 323,330,613   317,233,610 362,616,711 317,233,610
Beginning balance, average cost $ 8,374,199,813   $ 6,294,157,046 $ 5,667,962,993   $ 5,641,558,156 $ 6,294,157,046 $ 5,641,558,156
Beginning balance, fair value $ 8,886,943,805   6,543,418,555 [1] $ 4,921,091,926   4,906,017,787 $ 6,543,418,555 [1] $ 4,906,017,787
Silver bullion contributed (Ounce) | oz 130,002,203     76,785,902     310,430,109 108,791,946
Silver bullion contributed, average cost $ 2,950,693,999     $ 1,274,150,418     $ 5,803,042,212 $ 1,759,987,439
Silver bullion contributed, fair value $ 2,950,693,999     $ 1,274,150,418     $ 5,803,042,212 $ 1,759,987,439
Silver bullion distributed (Ounce) | oz (78,292,675)     (16,043,945)     (122,374,620) (41,179,997)
Silver bullion distributed, average cost $ (1,389,180,769)     $ (278,104,316)     $ (2,145,174,201) $ (723,851,160)
Silver bullion distributed, fair value (2,035,281,500)     (287,948,518)     (2,771,069,953) (675,060,719)
Silver bullion distributed, realized gain (loss) $ 646,100,731     $ 9,844,202     $ 625,895,752 $ (48,790,441)
Silver bullion sold to pay expenses (Ounce) | oz (600,508)     (416,200)     (1,555,682) (1,189,189)
Silver bullion sold to pay expenses, average cost $ (10,432,181)     $ (7,238,618)     $ (26,744,195) $ (20,923,958)
Silver bullion sold to pay expenses, fair value (14,444,111)     (6,927,348)     (30,247,526) (18,730,817)
Silver bullion sold to pay expenses, realized gain (loss) 4,011,930     (311,270)     3,503,331 (2,193,141)
Net realized gain (loss), fair value 650,112,661 $ (11,142,869) (9,570,709) 9,532,932 $ (17,462,196) (43,054,318) 629,399,083 (50,983,582)
Net change in unrealized appreciation/depreciation, fair value $ 2,589,764,531 $ 1,686,694,147 (1,423,211,664) $ 710,091,263 $ 57,866,685 (69,197,383) $ 2,853,247,014 $ 698,760,565
Ending balance (Ounce) | oz 549,116,518 498,007,498   383,656,370 323,330,613   549,116,518 383,656,370
Ending balance, average cost $ 9,925,280,862 $ 8,374,199,813   $ 6,656,770,477 $ 5,667,962,993   $ 9,925,280,862 $ 6,656,770,477
Ending balance, fair value 13,027,789,385 [1] 8,886,943,805   6,619,990,673 4,921,091,926   13,027,789,385 [1] 6,619,990,673
Ending balance, realized gain (loss) $ 650,112,661 $ (11,142,869) $ (9,570,709) $ 9,532,932 $ (17,462,196) $ (43,054,318) $ 629,399,083 $ (50,983,582)
[1] Cost of investment in silver bullion: $9,925,280,862 and $6,294,157,046, respectively.