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Fair Value Measurements (Details) - Schedule of estimated fair values - USD ($) | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Securities owned, at fair value |  |
Total Securities owned, at fair value | $ 18,687,000 | $ 3,204,000
Securities sold, not yet purchased, at fair value |  |
Total Securities sold, not yet purchased, at fair value | 1,000 | 2,000
U.S. government securities [Member] |  |
Cash and securities segregated for regulatory purposes |  |
Cash and securities segregated for regulatory purposes | 118,101,000 | 140,978,000
U.S. government securities owned [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value | 17,875,000 | 2,808,000
Certificates of deposit [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value | 113,000 | 92,000
Municipal securities [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value | 319,000 | 52,000
Corporate bonds [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value | 131,000 | 7,000
Equity securities [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value | 249,000 | 245,000
Securities sold, not yet purchased, at fair value |  |
Total Securities sold, not yet purchased, at fair value | 1,000 | 2,000
Level 1 [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value | 17,992,000 | 2,871,000
Securities sold, not yet purchased, at fair value |  |
Total Securities sold, not yet purchased, at fair value | 1,000 | 2,000
Level 1 [Member] | U.S. government securities [Member] |  |
Cash and securities segregated for regulatory purposes |  |
Cash and securities segregated for regulatory purposes | 118,101,000 | 140,978,000
Level 1 [Member] | U.S. government securities owned [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value | 17,875,000 | 2,808,000
Level 1 [Member] | Certificates of deposit [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value |  |
Level 1 [Member] | Municipal securities [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value |  |
Level 1 [Member] | Corporate bonds [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value |  |
Level 1 [Member] | Equity securities [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value | 117,000 | 63,000
Securities sold, not yet purchased, at fair value |  |
Total Securities sold, not yet purchased, at fair value | 1,000 | 2,000
Level 2 [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value | 695,000 | 333,000
Securities sold, not yet purchased, at fair value |  |
Total Securities sold, not yet purchased, at fair value |  |
Level 2 [Member] | U.S. government securities [Member] |  |
Cash and securities segregated for regulatory purposes |  |
Cash and securities segregated for regulatory purposes |  |
Level 2 [Member] | U.S. government securities owned [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value |  |
Level 2 [Member] | Certificates of deposit [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value | 113,000 | 92,000
Level 2 [Member] | Municipal securities [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value | 319,000 | 52,000
Level 2 [Member] | Corporate bonds [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value | 131,000 | 7,000
Level 2 [Member] | Equity securities [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value | 132,000 | 182,000
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 |  |
Level 3 [Member] | U.S. government securities [Member] |  |
Cash and securities segregated for regulatory purposes |  |
Cash and securities segregated for regulatory purposes |  |
Level 3 [Member] | U.S. government securities owned [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value |  |
Level 3 [Member] | Certificates of deposit [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value |  |
Level 3 [Member] | Municipal securities [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value |  |
Level 3 [Member] | Corporate bonds [Member] |  |
Securities owned, at fair value |  |
Total Securities owned, at fair value |  |
Level 3 [Member] | Equity securities [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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