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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2022
Fair Value Disclosures [Abstract] |
Schedule of estimated fair values |
|  | As of December 31, 2022
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and securities segregated for regulatory purposes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government securities |  | $ | 140,978,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 140,978,000 |
Securities owned, at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government securities |  | $ | 2,808,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,808,000 |
Certificates of deposit |  |  | — |  |  |  | 92,000 |  |  |  | — |  |  |  | 92,000 |
Municipal securities |  |  | — |  |  |  | 52,000 |  |  |  | — |  |  |  | 52,000 |
Corporate bonds |  |  | — |  |  |  | 7,000 |  |  |  | — |  |  |  | 7,000 |
Equity securities |  |  | 63,000 |  |  |  | 182,000 |  |  |  | — |  |  |  | 245,000 |
Total Securities owned, at fair value |  | $ | 2,871,000 |  |  | $ | 333,000 |  |  | $ | — |  |  | $ | 3,204,000 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities sold, not yet purchased, at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  | $ | 2,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,000 |
Total Securities sold, not yet purchased, at fair value |  | $ | 2,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,000 |
|  | As of December 31, 2021
|  |  | Level 1 |  |  |  | Level 2 |  |  |  | Level 3 |  |  |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities owned, at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government securities* |  | $ | 2,966,000 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,966,000 |
Certificates of deposit |  |  | — |  |  |  | 91,000 |  |  |  | — |  |  |  | 91,000 |
Corporate bonds |  |  | — |  |  |  | 12,000 |  |  |  | — |  |  |  | 12,000 |
Equity securities |  |  | 489,000 |  |  |  | 433,000 |  |  |  | — |  |  |  | 922,000 |
Total Securities owned, at fair value |  | $ | 3,455,000 |  |  | $ | 536,000 |  |  | $ | — |  |  | $ | 3,991,000 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities sold, not yet purchased, at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  | $ | — |  |  | $ | 24,000 |  |  | $ | — |  |  | $ | 24,000 |
Total Securities sold, not yet purchased, at fair value |  | $ | — |  |  | $ | 24,000 |  |  | $ | — |  |  | $ | 24,000 |
*As of December 31, 2021, the U.S. government securities had a maturity date of August 15, 2024.
Schedule of U.S. government securities with the below market values and maturity dates |
|  | As of December 31, 2022
Market value of U.S. government securities |  |  |
Maturing 03/23/2023, 3.750% Discount Rate |  | $ | 24,768,000
Maturing 05/18/2023, 2.700% Discount Rate |  |  | 9,831,000
Maturing 08/31/2023, 1.375% Coupon Rate |  |  | 9,777,000
Maturing 12/31/2023, 0.750% Coupon Rate |  |  | 62,497,000
Maturing 01/31/2024, 0.875% Coupon Rate |  |  | 23,995,000
Maturing 05/31/2024, 2.500% Coupon Rate |  |  | 9,707,000
Maturing 08/15/2024, 0.375% Coupon Rate |  |  | 2,808,000
Accrued interest |  |  | 404,000
Total Market value of investment in U.S. government securities |  | $ | 143,787,000
Schedule of estimated fair values |
|  | As of December 31,
|  | 2022 |  | 2021
Equity method investment in related party |  | $ | 2,584,000 |  | $ | —

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