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Financial Highlights Per Share Performance (Tables) | 12 Months Ended
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Dec. 31, 2023
Investment Company, Financial Highlights [Abstract] |
Summary of per share data |
|  | Years Ended December 31, |
| 2023 |  |  | 2022 |  |  | 2021 |
Per Share Data |  |  |  |  |  |  |  |  |  |  |  |
Principal Market net asset value, beginning of year |  | $ | 15.11 |  |  | $ | 42.72 |  |  | $ | 27.73 |
Net increase (decrease) in net assets from investment operations: |  |  |  |  |  |  |  |  |  |  |  |
Net investment loss |  |  | (0.52 | ) |  |  | (0.52 | ) |  |  | (0.89 | )
Net realized and unrealized gain (loss) |  |  | 23.47 |  |  |  | (27.09 | ) |  |  | 15.88 |
Net increase (decrease) in net assets resulting from operations |  |  | 22.95 |  |  |  | (27.61 | ) |  |  | 14.99 |
Principal Market net asset value, end of year |  | $ | 38.06 |  |  | $ | 15.11 |  |  | $ | 42.72 |
Total return |  |  | 151.89 | % |  |  | (64.63 | )% |  |  | 54.06 | %
Ratios to average net assets: |  |  |  |  |  |  |  |  |  |  |  |
Net investment loss |  |  | (2.00 | )% |  |  | (2.00 | )% |  |  | (2.00 | )%
Expenses |  |  | (2.00 | )% |  |  | (2.00 | )% |  |  | (2.00 | )%

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- Definition Tabular disclosure of financial highlights. Includes, but is not limited to, per share information, income and expense ratios, total return, capital commitment and fee waiver. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 205 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480737/946-205-50-1 + Details
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