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Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($) | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Securities owned, at fair value |  |
Total Securities owned, at fair value | $ 21,385,000 | $ 18,038,000
Securities sold, not yet purchased, at fair value |  |
Total Securities sold, not yet purchased, at fair value | 26,000 | 2,000
Level 1 [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value | 21,199,000 | 17,784,000
Securities sold, not yet purchased, at fair value |  |
Total Securities sold, not yet purchased, at fair value | 26,000 | 2,000
Level 2 [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value | 186,000 | 254,000
Securities sold, not yet purchased, at fair value |  |
Total Securities sold, not yet purchased, at fair value |  |
Level 3 [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value |  |
Securities sold, not yet purchased, at fair value |  |
Total Securities sold, not yet purchased, at fair value |  |
U.S. Government Securities [Member] |  |
Cash and securities segregated for regulatory purposes |  |
Cash and securities segregated for regulatory purposes | 68,758,000 | 115,515,000
Securities owned, at fair value |  |
Total Securities owned, at fair value | 20,086,000 | 17,636,000
U.S. Government Securities [Member] | Level 1 [Member] |  |
Cash and securities segregated for regulatory purposes |  |
Cash and securities segregated for regulatory purposes | 68,758,000 | 115,515,000
Securities owned, at fair value |  |
Total Securities owned, at fair value | 20,086,000 | 17,636,000
U.S. Government Securities [Member] | Level 2 [Member] |  |
Cash and securities segregated for regulatory purposes |  |
Cash and securities segregated for regulatory purposes |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value |  |
U.S. Government Securities [Member] | Level 3 [Member] |  |
Cash and securities segregated for regulatory purposes |  |
Cash and securities segregated for regulatory purposes |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value |  |
Certificates of Deposit [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value | 112,000 | 114,000
Certificates of Deposit [Member] | Level 1 [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value |  |
Certificates of Deposit [Member] | Level 2 [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value | 112,000 | 114,000
Certificates of Deposit [Member] | Level 3 [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value |  |
Corporate Bonds [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value | 2,000 | 3,000
Corporate Bonds [Member] | Level 1 [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value |  |
Corporate Bonds [Member] | Level 2 [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value | 2,000 | 3,000
Corporate Bonds [Member] | Level 3 [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value |  |
Options [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value | 58,000 | 2,000
Securities sold, not yet purchased, at fair value |  |
Total Securities sold, not yet purchased, at fair value | 25,000 |
Options [Member] | Level 1 [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value | 58,000 | 2,000
Securities sold, not yet purchased, at fair value |  |
Total Securities sold, not yet purchased, at fair value | 25,000 |
Options [Member] | Level 2 [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value |  |
Options [Member] | Level 3 [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value |  |
Securities sold, not yet purchased, at fair value |  |
Total Securities sold, not yet purchased, at fair value |  |
Equity Securities [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value | 1,127,000 | 283,000
Securities sold, not yet purchased, at fair value |  |
Total Securities sold, not yet purchased, at fair value | 1,000 | 2,000
Equity Securities [Member] | Level 1 [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value | 1,055,000 | 146,000
Securities sold, not yet purchased, at fair value |  |
Total Securities sold, not yet purchased, at fair value | 1,000 | 2,000
Equity Securities [Member] | Level 2 [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value | 72,000 | 137,000
Securities sold, not yet purchased, at fair value |  |
Total Securities sold, not yet purchased, at fair value |  |
Equity Securities [Member] | Level 3 [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value |  |
Securities sold, not yet purchased, at fair value |  |
Total Securities sold, not yet purchased, at fair value |  |

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