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Note 2 - Significant Accounting Policies - Activity in Bitcoin (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Sep. 30, 2024
USD ($)
Beginning balance 306,979   0 0
Beginning balance, average cost $ 17,749,065,590   $ 0 $ 0
Beginning balance, fair value $ 19,453,015,133   0 $ 0
Bitcoin purchased 60,053     367,805
Bitcoin purchased, average cost $ 3,796,560,491     $ 21,589,313,309
Bitcoin purchased, fair value $ 3,796,560,491     $ 21,589,313,309
Bitcoin sold for the redemption of shares (391)     (1,031)
Bitcoin sold for the redemption of shares, average cost $ (22,898,817)     $ (59,047,292)
Bitcoin sold for the redemption of shares, fair value (22,812,387)     (59,833,750)
Bitcoin sold for the redemption of shares, realized gain (loss) $ (86,430)     $ 786,458
Bitcoin sold to pay expenses (193)     (326)
Bitcoin sold to pay expenses, average cost $ (11,212,559)     $ (18,751,312)
Bitcoin sold to pay expenses, fair value (10,650,112)     (19,643,995)
Bitcoin sold to pay expenses, realized gain (loss) (562,447)     892,683
Net realized gain (loss), fair value (648,877) $ 2,227,493 100,525 1,679,141
Net change in unrealized appreciation/depreciation, fair value $ 119,089,128 $ (2,102,796,450) 3,806,745,993 $ 1,823,038,671
Ending balance 366,448 306,979   366,448
Ending balance, average cost $ 21,511,514,705 $ 17,749,065,590   $ 21,511,514,705
Ending balance, fair value 23,334,553,376 19,453,015,133   23,334,553,376
Ending balance, realized gain (loss) $ (648,877) $ 2,227,493 $ 100,525 $ 1,679,141