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Fair Value Measurements (Details) - Schedule of Financial Assets and Liabilities not Measured at Fair Value - USD ($) | Jun. 30, 2024 | Dec. 31, 2023
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Financial assets, not measured at fair value |  |
Cash and cash equivalents | $ 5,200,000 | $ 5,735,000
Cash – segregated for regulatory purposes | 128,081,000 | 158,802,000
Securities borrowed | 253,781,000 | 394,709,000
Receivables from customers | 74,875,000 | 72,823,000
Receivables from non-customers | 455,000 | 241,000
Receivables from broker-dealers and clearing organizations | 8,720,000 | 3,863,000
Other receivables | 4,097,000 | 2,424,000
Deposits with broker-dealers and clearing organizations | 7,279,000 | 7,885,000
Total financial assets, not measured at fair value | 482,488,000 | 646,482,000
Financial liabilities, not measured at fair value |  |
Securities loaned | 272,515,000 | 419,433,000
Payables to customers | 233,873,000 | 289,777,000
Payables to non-customers | 186,000 | 713,000
Drafts payable | 1,527,000 | 1,726,000
Payables to broker-dealers and clearing organizations | 5,015,000 | 481,000
Deferred contract incentive | 821,000 | 1,246,000
Long-term debt | 4,270,000 | 4,313,000
Contract termination liability | 3,493,000 | 4,462,000
Total financial liabilities, not measured at fair value | 521,700,000 | 722,151,000
Fair Value, Inputs, Level 1 [Member] |  |
Financial assets, not measured at fair value |  |
Cash and cash equivalents | 5,200,000 | 5,735,000
Cash – segregated for regulatory purposes | 128,081,000 | 158,802,000
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 | 133,281,000 | 164,537,000
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 |  |
Long-term debt |  |
Contract termination liability |  |
Total financial liabilities, not measured at fair value |  |
Fair Value, Inputs, Level 2 [Member] |  |
Financial assets, not measured at fair value |  |
Cash and cash equivalents |  |
Cash – segregated for regulatory purposes |  |
Securities borrowed | 253,781,000 | 394,709,000
Receivables from customers | 74,875,000 | 72,823,000
Receivables from non-customers | 455,000 | 241,000
Receivables from broker-dealers and clearing organizations | 8,720,000 | 3,863,000
Other receivables | 4,097,000 | 2,424,000
Deposits with broker-dealers and clearing organizations | 7,279,000 | 7,885,000
Total financial assets, not measured at fair value | 349,207,000 | 481,945,000
Financial liabilities, not measured at fair value |  |
Securities loaned | 272,515,000 | 419,433,000
Payables to customers | 233,873,000 | 289,777,000
Payables to non-customers | 186,000 | 713,000
Drafts payable | 1,527,000 | 1,726,000
Payables to broker-dealers and clearing organizations | 5,015,000 | 481,000
Deferred contract incentive | 821,000 | 1,246,000
Long-term debt | 4,270,000 | 4,313,000
Contract termination liability | 3,493,000 | 4,462,000
Total financial liabilities, not measured at fair value | 521,700,000 | 722,151,000
Fair Value, Inputs, 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 |  |
Long-term debt |  |
Contract termination liability |  |
Total financial liabilities, not measured at fair value |  |
Fair Value [Member] |  |
Financial assets, not measured at fair value |  |
Cash and cash equivalents | 5,200,000 | 5,735,000
Cash – segregated for regulatory purposes | 128,081,000 | 158,802,000
Securities borrowed | 253,781,000 | 394,709,000
Receivables from customers | 74,875,000 | 72,823,000
Receivables from non-customers | 455,000 | 241,000
Receivables from broker-dealers and clearing organizations | 8,720,000 | 3,863,000
Other receivables | 4,097,000 | 2,424,000
Deposits with broker-dealers and clearing organizations | 7,279,000 | 7,885,000
Total financial assets, not measured at fair value | 482,488,000 | 646,482,000
Financial liabilities, not measured at fair value |  |
Securities loaned | 272,515,000 | 419,433,000
Payables to customers | 233,873,000 | 289,777,000
Payables to non-customers | 186,000 | 713,000
Drafts payable | 1,527,000 | 1,726,000
Payables to broker-dealers and clearing organizations | 5,015,000 | 481,000
Deferred contract incentive | 821,000 | 1,246,000
Long-term debt | 4,270,000 | 4,313,000
Contract termination liability | 3,493,000 | 4,462,000
Total financial liabilities, not measured at fair value | $ 521,700,000 | $ 722,151,000

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