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Fair Value Measurements - Schedule of Financial Assets and Liabilities not Measured at Fair Value (Details) - USD ($) | Jun. 30, 2025 | Dec. 31, 2024
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Financial assets, not measured at fair value |  |
Cash and cash equivalents | $ 28,949,000 | $ 32,629,000
Cash – segregated for regulatory purposes | 101,214,000 | 135,829,000
Securities borrowed | 238,721,000 | 139,040,000
Receivables from customers | 79,858,000 | 84,367,000
Receivables from non-customers | 1,411,000 | 607,000
Receivables from broker-dealers and clearing organizations | 5,600,000 | 3,920,000
Other receivables | 4,869,000 | 2,744,000
Deposits with broker-dealers and clearing organizations | 6,877,000 | 4,227,000
Total financial assets, not measured at fair value | 467,499,000 | 403,363,000
Financial liabilities, not measured at fair value |  |
Securities loaned | 235,674,000 | 184,962,000
Payables to customers | 217,870,000 | 227,129,000
Payables to non-customers | 226,000 | 3,297,000
Drafts payable | 1,179,000 | 1,331,000
Payables to broker-dealers and clearing organizations | 1,179,000 | 444,000
Deferred contract incentive | 71,000 | 496,000
Other deferred revenue | 20,000 |
Long-term debt | 4,184,000 | 4,228,000
Contract termination liability | 1,673,000 | 2,567,000
Total financial liabilities, not measured at fair value | 462,076,000 | 424,454,000
Fair Value [Member] |  |
Financial assets, not measured at fair value |  |
Cash and cash equivalents | 28,949,000 | 32,629,000
Cash – segregated for regulatory purposes | 101,214,000 | 135,829,000
Securities borrowed | 238,721,000 | 139,040,000
Receivables from customers | 79,858,000 | 84,367,000
Receivables from non-customers | 1,411,000 | 607,000
Receivables from broker-dealers and clearing organizations | 5,600,000 | 3,920,000
Other receivables | 4,869,000 | 2,744,000
Deposits with broker-dealers and clearing organizations | 6,877,000 | 4,227,000
Total financial assets, not measured at fair value | 467,499,000 | 403,363,000
Financial liabilities, not measured at fair value |  |
Securities loaned | 235,674,000 | 184,962,000
Payables to customers | 217,870,000 | 227,129,000
Payables to non-customers | 226,000 | 3,297,000
Drafts payable | 1,179,000 | 1,331,000
Payables to broker-dealers and clearing organizations | 1,179,000 | 444,000
Deferred contract incentive | 71,000 | 496,000
Other deferred revenue | 20,000 |
Long-term debt | 4,184,000 | 4,228,000
Contract termination liability | 1,673,000 | 2,567,000
Total financial liabilities, not measured at fair value | 462,076,000 | 424,454,000
Level 1 [Member] |  |
Financial assets, not measured at fair value |  |
Cash and cash equivalents | 28,949,000 | 32,629,000
Cash – segregated for regulatory purposes | 101,214,000 | 135,829,000
Securities borrowed |  |
Receivables from customers |  |
Receivables from non-customers |  |
Receivables from broker-dealers and clearing organizations |  |
Other receivables |  |
Deposits with broker-dealers and clearing organizations |  |
Total financial assets, not measured at fair value | 130,163,000 | 168,458,000
Financial liabilities, not measured at fair value |  |
Securities loaned |  |
Payables to customers |  |
Payables to non-customers |  |
Drafts payable |  |
Payables to broker-dealers and clearing organizations |  |
Deferred contract incentive |  |
Other deferred revenue |  |
Long-term debt |  |
Contract termination liability |  |
Total financial liabilities, not measured at fair value |  |
Level 2 [Member] |  |
Financial assets, not measured at fair value |  |
Cash and cash equivalents |  |
Cash – segregated for regulatory purposes |  |
Securities borrowed | 238,721,000 | 139,040,000
Receivables from customers | 79,858,000 | 84,367,000
Receivables from non-customers | 1,411,000 | 607,000
Receivables from broker-dealers and clearing organizations | 5,600,000 | 3,920,000
Other receivables | 4,869,000 | 2,744,000
Deposits with broker-dealers and clearing organizations | 6,877,000 | 4,227,000
Total financial assets, not measured at fair value | 337,336,000 | 234,905,000
Financial liabilities, not measured at fair value |  |
Securities loaned | 235,674,000 | 184,962,000
Payables to customers | 217,870,000 | 227,129,000
Payables to non-customers | 226,000 | 3,297,000
Drafts payable | 1,179,000 | 1,331,000
Payables to broker-dealers and clearing organizations | 1,179,000 | 444,000
Deferred contract incentive | 71,000 | 496,000
Other deferred revenue | 20,000 |
Long-term debt | 4,184,000 | 4,228,000
Contract termination liability | 1,673,000 | 2,567,000
Total financial liabilities, not measured at fair value | 462,076,000 | 424,454,000
Level 3 [Member] |  |
Financial assets, not measured at fair value |  |
Cash and cash equivalents |  |
Cash – segregated for regulatory purposes |  |
Securities borrowed |  |
Receivables from customers |  |
Receivables from non-customers |  |
Receivables from broker-dealers and clearing organizations |  |
Other receivables |  |
Deposits with broker-dealers and clearing organizations |  |
Total financial assets, not measured at fair value |  |
Financial liabilities, not measured at fair value |  |
Securities loaned |  |
Payables to customers |  |
Payables to non-customers |  |
Drafts payable |  |
Payables to broker-dealers and clearing organizations |  |
Deferred contract incentive |  |
Other deferred revenue |  |
Long-term debt |  |
Contract termination liability |  |
Total financial liabilities, not measured at fair value |  |

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