Note 2 - Significant Accounting Policies - Activity in Bitcoin (Details) |
3 Months Ended | 6 Months Ended | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Jun. 30, 2025
USD ($)
|
Mar. 31, 2025
USD ($)
|
Jun. 30, 2024
USD ($)
|
Mar. 31, 2024
USD ($)
|
Jun. 30, 2025
USD ($)
|
Jun. 30, 2024
USD ($)
|
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| Beginning balance | 576,038 | 551,918 | 252,011 | 0 | 551,918 | 0 | ||||||||||||
| Beginning balance, average cost | $ 40,686,575,306 | $ 37,372,942,571 | $ 13,984,500,952 | $ 0 | $ 37,372,942,571 | $ 0 | ||||||||||||
| Beginning balance, fair value | $ 47,785,797,093 | 51,530,013,513 | $ 17,791,246,945 | 0 | $ 51,530,013,513 | $ 0 | ||||||||||||
| Bitcoin purchased | 133,790 | 55,736 | 190,888 | 307,752 | ||||||||||||||
| Bitcoin purchased, average cost | $ 13,633,363,295 | $ 3,807,994,861 | $ 19,246,756,195 | $ 17,792,752,818 | ||||||||||||||
| Bitcoin purchased, fair value | $ 13,633,363,295 | $ 3,807,994,861 | $ 19,246,756,195 | $ 17,792,752,818 | ||||||||||||||
| Bitcoin sold for the redemption of shares | (12,590) | (640) | (45,218) | (640) | ||||||||||||||
| Bitcoin sold for the redemption of shares, average cost | $ (917,399,868) | $ (36,148,475) | $ (3,192,791,619) | $ (36,148,475) | ||||||||||||||
| Bitcoin sold for the redemption of shares, fair value | (1,171,783,539) | (37,021,363) | (4,071,574,578) | (37,021,363) | ||||||||||||||
| Bitcoin sold for the redemption of shares, realized gain (loss) | $ 254,383,671 | $ 872,888 | $ 878,782,959 | $ 872,888 | ||||||||||||||
| Bitcoin sold to pay expenses | (363) | (128) | (713) | (133) | ||||||||||||||
| Bitcoin sold to pay expenses, average cost | $ (26,420,452) | $ (7,281,748) | $ (50,788,866) | $ (7,538,753) | ||||||||||||||
| Bitcoin sold to pay expenses, fair value | (34,107,971) | (8,636,353) | (66,916,943) | (8,993,883) | ||||||||||||||
| Bitcoin sold to pay expenses, realized gain (loss) | 7,687,519 | 1,354,605 | 16,128,077 | 1,455,130 | ||||||||||||||
| Net realized gain (loss), fair value | 262,071,190 | [1] | 632,839,846 | 2,227,493 | [2] | 100,525 | 894,911,036 | [3] | 2,328,018 | [4] | ||||||||
| Net change in unrealized appreciation/depreciation, fair value | $ 14,244,730,958 | $ (7,057,849,155) | $ (2,102,796,450) | $ 3,806,745,993 | $ 7,186,881,803 | $ 1,703,949,543 | ||||||||||||
| Ending balance | 696,875 | 576,038 | 306,979 | 252,011 | 696,875 | 306,979 | ||||||||||||
| Ending balance, average cost | $ 53,376,118,281 | $ 40,686,575,306 | $ 17,749,065,590 | $ 13,984,500,952 | $ 53,376,118,281 | $ 17,749,065,590 | ||||||||||||
| Ending balance, fair value | 74,720,071,026 | 47,785,797,093 | 19,453,015,133 | 17,791,246,945 | 74,720,071,026 | 19,453,015,133 | ||||||||||||
| Ending balance, realized gain (loss) | $ 262,071,190 | [1] | $ 632,839,846 | $ 2,227,493 | [2] | $ 100,525 | $ 894,911,036 | [3] | $ 2,328,018 | [4] | ||||||||
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