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Disclosure - Significant Accounting Policies (Policies) Sheet http://www.cohencpa.com/20260331/role/statement-significant-accounting-policies-policies Significant Accounting Policies (Policies) Policies http://www.cohencpa.com/20260331/role/statement-note-3-summary-of-significant-accounting-policies 33 false false R34.htm 995478 - Disclosure - Note 5 - Investment Banking and New Issue and Net Trading (Tables) Sheet http://www.cohencpa.com/20260331/role/statement-note-5-investment-banking-and-new-issue-and-net-trading-tables Note 5 - Investment Banking and New Issue and Net Trading (Tables) Tables http://www.cohencpa.com/20260331/role/statement-note-5-investment-banking-and-new-issue-and-net-trading 34 false false R35.htm 995479 - Disclosure - Note 6 - Receivables From and Payables to Brokers, Dealers, and Clearing Agencies (Tables) Sheet http://www.cohencpa.com/20260331/role/statement-note-6-receivables-from-and-payables-to-brokers-dealers-and-clearing-agencies-tables Note 6 - Receivables From and Payables to Brokers, Dealers, and Clearing Agencies (Tables) Tables http://www.cohencpa.com/20260331/role/statement-note-6-receivables-from-and-payables-to-brokers-dealers-and-clearing-agencies 35 false false R36.htm 995480 - Disclosure - Note 7 - Financial Instruments (Tables) Sheet http://www.cohencpa.com/20260331/role/statement-note-7-financial-instruments-tables Note 7 - Financial Instruments (Tables) Tables http://www.cohencpa.com/20260331/role/statement-note-7-financial-instruments 36 false false R37.htm 995481 - Disclosure - Note 8 - Fair Value Disclosures (Tables) Sheet http://www.cohencpa.com/20260331/role/statement-note-8-fair-value-disclosures-tables Note 8 - Fair Value Disclosures (Tables) Tables http://www.cohencpa.com/20260331/role/statement-note-8-fair-value-disclosures 37 false false R38.htm 995482 - Disclosure - Note 9 - Derivative Financial Instruments (Tables) Sheet http://www.cohencpa.com/20260331/role/statement-note-9-derivative-financial-instruments-tables Note 9 - Derivative Financial Instruments (Tables) Tables http://www.cohencpa.com/20260331/role/statement-note-9-derivative-financial-instruments 38 false false R39.htm 995483 - Disclosure - Note 10 - Collateralized Securities Transactions (Tables) Sheet http://www.cohencpa.com/20260331/role/statement-note-10-collateralized-securities-transactions-tables Note 10 - Collateralized Securities Transactions (Tables) Tables http://www.cohencpa.com/20260331/role/statement-note-10-collateralized-securities-transactions 39 false false R40.htm 995484 - Disclosure - Note 11 - Investments in Equity Method Affiliates (Tables) Sheet http://www.cohencpa.com/20260331/role/statement-note-11-investments-in-equity-method-affiliates-tables Note 11 - Investments in Equity Method Affiliates (Tables) Tables http://www.cohencpa.com/20260331/role/statement-note-11-investments-in-equity-method-affiliates 40 false false R41.htm 995485 - Disclosure - Note 12 - Leases (Tables) Sheet http://www.cohencpa.com/20260331/role/statement-note-12-leases-tables Note 12 - Leases (Tables) Tables http://www.cohencpa.com/20260331/role/statement-note-12-leases 41 false false R42.htm 995486 - Disclosure - Note 13 - Other Receivables, Other Assets, Accounts Payable and Other Liabilities, and Accrued Compensation (Tables) Sheet http://www.cohencpa.com/20260331/role/statement-note-13-other-receivables-other-assets-accounts-payable-and-other-liabilities-and-accrued-compensation-tables Note 13 - Other Receivables, Other Assets, Accounts Payable and Other Liabilities, and Accrued Compensation (Tables) Tables http://www.cohencpa.com/20260331/role/statement-note-13-other-receivables-other-assets-accounts-payable-and-other-liabilities-and-accrued-compensation 42 false false R43.htm 995487 - Disclosure - Note 14 - Variable Interest Entities (Tables) Sheet http://www.cohencpa.com/20260331/role/statement-note-14-variable-interest-entities-tables Note 14 - Variable Interest Entities (Tables) Tables http://www.cohencpa.com/20260331/role/statement-note-14-variable-interest-entities 43 false false R44.htm 995488 - Disclosure - Note 15 - Debt (Tables) Sheet http://www.cohencpa.com/20260331/role/statement-note-15-debt-tables Note 15 - Debt (Tables) Tables http://www.cohencpa.com/20260331/role/statement-note-15-debt- 44 false false R45.htm 995489 - Disclosure - Note 16 - Equity (Tables) Sheet http://www.cohencpa.com/20260331/role/statement-note-16-equity-tables Note 16 - Equity (Tables) Tables http://www.cohencpa.com/20260331/role/statement-note-16-equity- 45 false false R46.htm 995490 - Disclosure - Note 17 - Income Taxes (Tables) Sheet http://www.cohencpa.com/20260331/role/statement-note-17-income-taxes-tables Note 17 - Income Taxes (Tables) Tables http://www.cohencpa.com/20260331/role/statement-note-17-income-taxes- 46 false false R47.htm 995491 - Disclosure - Note 19 - Earnings (Loss) Per Common Share (Tables) Sheet http://www.cohencpa.com/20260331/role/statement-note-19-earnings-loss-per-common-share-tables Note 19 - Earnings (Loss) Per Common Share (Tables) Tables http://www.cohencpa.com/20260331/role/statement-note-19-earnings-loss-per-common-share 47 false false R48.htm 995492 - Disclosure - Note 21 - Segment and Geographic Information (Tables) Sheet http://www.cohencpa.com/20260331/role/statement-note-21-segment-and-geographic-information-tables Note 21 - Segment and Geographic Information (Tables) Tables http://www.cohencpa.com/20260331/role/statement-note-21-segment-and-geographic-information 48 false false R49.htm 995493 - Disclosure - Note 23 - Related Party Transactions (Tables) Sheet http://www.cohencpa.com/20260331/role/statement-note-23-related-party-transactions-tables Note 23 - Related Party Transactions (Tables) Tables http://www.cohencpa.com/20260331/role/statement-note-23-related-party-transactions- 49 false false R50.htm 995494 - Disclosure - Note 24 - Due From Due to Related Parties (Tables) Sheet http://www.cohencpa.com/20260331/role/statement-note-24-due-from-due-to-related-parties-tables Note 24 - Due From Due to Related Parties (Tables) Tables http://www.cohencpa.com/20260331/role/statement-note-24-due-from-due-to-related-parties 50 false false R51.htm 995495 - Disclosure - Note 1 - Organization and Nature of Operations (Details Textual) Sheet http://www.cohencpa.com/20260331/role/statement-note-1-organization-and-nature-of-operations-details-textual Note 1 - Organization and Nature of Operations (Details Textual) Details http://www.cohencpa.com/20260331/role/statement-note-1-organization-and-nature-of-operations 51 false false R52.htm 995496 - Disclosure - Note 2 - Basis of Presentation (Details Textual) Sheet http://www.cohencpa.com/20260331/role/statement-note-2-basis-of-presentation-details-textual Note 2 - Basis of Presentation (Details Textual) Details http://www.cohencpa.com/20260331/role/statement-note-2-basis-of-presentation 52 false false R53.htm 995497 - Disclosure - Note 3 - Summary of Significant Accounting Policies (Details Textual) Sheet http://www.cohencpa.com/20260331/role/statement-note-3-summary-of-significant-accounting-policies-details-textual Note 3 - Summary of Significant Accounting Policies (Details Textual) Details 53 false false R54.htm 995498 - Disclosure - Note 4 - Other Recent Business Transactions or Events (Details Textual) Sheet http://www.cohencpa.com/20260331/role/statement-note-4-other-recent-business-transactions-or-events-details-textual Note 4 - Other Recent Business Transactions or Events (Details Textual) Details http://www.cohencpa.com/20260331/role/statement-note-4-other-recent-business-transactions-or-events 54 false false R55.htm 995499 - Disclosure - Note 5 - Investment Banking and New Issue and Net Trading (Details Textual) Sheet http://www.cohencpa.com/20260331/role/statement-note-5-investment-banking-and-new-issue-and-net-trading-details-textual Note 5 - Investment Banking and New Issue and Net Trading (Details Textual) Details http://www.cohencpa.com/20260331/role/statement-note-5-investment-banking-and-new-issue-and-net-trading-tables 55 false false R56.htm 995500 - Disclosure - Note 5 - Investment Banking and New Issue and Net Trading - Investment Banking and New Issue (Details) Sheet http://www.cohencpa.com/20260331/role/statement-note-5-investment-banking-and-new-issue-and-net-trading-investment-banking-and-new-issue-details Note 5 - Investment Banking and New Issue and Net Trading - Investment Banking and New Issue (Details) Details 56 false false R57.htm 995501 - Disclosure - Note 5 - Investment Banking and New Issue and Net Trading - Net Trading (Details) Sheet http://www.cohencpa.com/20260331/role/statement-note-5-investment-banking-and-new-issue-and-net-trading-net-trading-details Note 5 - Investment Banking and New Issue and Net Trading - Net Trading (Details) Details http://www.cohencpa.com/20260331/role/statement-note-5-investment-banking-and-new-issue-and-net-trading-tables 57 false false R58.htm 995502 - Disclosure - Note 6 - Receivables from and Payables to Brokers, Dealers, and Clearing Agencies - Receivables from and Payables to from Brokers, Dealers and Clearing Agencies (Details) Sheet http://www.cohencpa.com/20260331/role/statement-note-6-receivables-from-and-payables-to-brokers-dealers-and-clearing-agencies-receivables-from-and-payables-to-from-brokers-dealers-and-clearing-agencies-details Note 6 - Receivables from and Payables to Brokers, Dealers, and Clearing Agencies - Receivables from and Payables to from Brokers, Dealers and Clearing Agencies (Details) Details 58 false false R59.htm 995503 - Disclosure - Note 7 - Financial Instruments (Details Textual) Sheet http://www.cohencpa.com/20260331/role/statement-note-7-financial-instruments-details-textual Note 7 - Financial Instruments (Details Textual) Details http://www.cohencpa.com/20260331/role/statement-note-7-financial-instruments-tables 59 false false R60.htm 995504 - Disclosure - Note 7 - Financial Instruments - Investments - Trading (Details) Sheet http://www.cohencpa.com/20260331/role/statement-note-7-financial-instruments-investments-trading-details Note 7 - Financial Instruments - Investments - Trading (Details) Details 60 false false R61.htm 995505 - Disclosure - Note 7 - Financial Instruments - Financial Instruments Sold, Not Yet Purchased (Details) Sheet http://www.cohencpa.com/20260331/role/statement-note-7-financial-instruments-financial-instruments-sold-not-yet-purchased-details Note 7 - Financial Instruments - Financial Instruments Sold, Not Yet Purchased (Details) Details 61 false false R62.htm 995506 - Disclosure - Note 7 - Financial Instruments - Other Investments, at Fair Value (Details) Sheet http://www.cohencpa.com/20260331/role/statement-note-7-financial-instruments-other-investments-at-fair-value-details Note 7 - Financial Instruments - Other Investments, at Fair Value (Details) Details 62 false false R63.htm 995507 - Disclosure - Note 8 - Fair Value Disclosures (Details Textual) Sheet http://www.cohencpa.com/20260331/role/statement-note-8-fair-value-disclosures-details-textual Note 8 - Fair Value Disclosures (Details Textual) Details http://www.cohencpa.com/20260331/role/statement-note-8-fair-value-disclosures-tables 63 false false R64.htm 995508 - Disclosure - Note 8 - Fair Value Disclosures - Fair Value Measurements on a Recurring Basis (Details) Sheet http://www.cohencpa.com/20260331/role/statement-note-8-fair-value-disclosures-fair-value-measurements-on-a-recurring-basis-details Note 8 - Fair Value Disclosures - Fair Value Measurements on a Recurring Basis (Details) Details 64 false false R65.htm 995509 - Disclosure - Note 8 - Fair Value Disclosures - Fair Value Measurements of Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent) (Details) Sheet http://www.cohencpa.com/20260331/role/statement-note-8-fair-value-disclosures-fair-value-measurements-of-investments-in-certain-entities-that-calculate-net-asset-value-per-share-or-its-equivalent-details Note 8 - Fair Value Disclosures - Fair Value Measurements of Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent) (Details) Details 65 false false R66.htm 995510 - Disclosure - Note 9 - Derivative Financial Instruments (Details Textual) Sheet http://www.cohencpa.com/20260331/role/statement-note-9-derivative-financial-instruments-details-textual Note 9 - Derivative Financial Instruments (Details Textual) Details http://www.cohencpa.com/20260331/role/statement-note-9-derivative-financial-instruments-tables 66 false false R67.htm 995511 - Disclosure - Note 9 - Derivative Financial Instruments - Balance Sheet Information (Details) Sheet http://www.cohencpa.com/20260331/role/statement-note-9-derivative-financial-instruments-balance-sheet-information-details Note 9 - Derivative Financial Instruments - Balance Sheet Information (Details) Details 67 false false R68.htm 995512 - Disclosure - Note 9 - Derivative Financial Instruments - Statement of Operations Information (Details) Sheet http://www.cohencpa.com/20260331/role/statement-note-9-derivative-financial-instruments-statement-of-operations-information-details Note 9 - Derivative Financial Instruments - Statement of Operations Information (Details) Details 68 false false R69.htm 995513 - Disclosure - Note 10 - Collateralized Securities Transactions (Details Textual) Sheet http://www.cohencpa.com/20260331/role/statement-note-10-collateralized-securities-transactions-details-textual Note 10 - Collateralized Securities Transactions (Details Textual) Details http://www.cohencpa.com/20260331/role/statement-note-10-collateralized-securities-transactions-tables 69 false false R70.htm 995514 - Disclosure - Note 10 - Collateralized Securities Transactions - Secured Borrowings (Details) Sheet http://www.cohencpa.com/20260331/role/statement-note-10-collateralized-securities-transactions-secured-borrowings-details Note 10 - Collateralized Securities Transactions - Secured Borrowings (Details) Details 70 false false R71.htm 995515 - Disclosure - Note 11 - Investments in Equity Method Affiliates - Investments in Equity Method Affiliates (Details) Sheet http://www.cohencpa.com/20260331/role/statement-note-11-investments-in-equity-method-affiliates-investments-in-equity-method-affiliates-details Note 11 - Investments in Equity Method Affiliates - Investments in Equity Method Affiliates (Details) Details 71 false false R72.htm 995516 - Disclosure - Note 12 - Leases (Details Textual) Sheet http://www.cohencpa.com/20260331/role/statement-note-12-leases-details-textual Note 12 - Leases (Details Textual) Details http://www.cohencpa.com/20260331/role/statement-note-12-leases-tables 72 false false R73.htm 995517 - Disclosure - Note 12 - Leases - Future Maturity of Lease Liabilities (Details) Sheet http://www.cohencpa.com/20260331/role/statement-note-12-leases-future-maturity-of-lease-liabilities-details Note 12 - Leases - Future Maturity of Lease Liabilities (Details) Details 73 false false R74.htm 995518 - Disclosure - Note 13 - Other Receivables, Other Assets, Accounts Payable and Other Liabilities, and Accrued Compensation (Details Textual) Sheet http://www.cohencpa.com/20260331/role/statement-note-13-other-receivables-other-assets-accounts-payable-and-other-liabilities-and-accrued-compensation-details-textual Note 13 - Other Receivables, Other Assets, Accounts Payable and Other Liabilities, and Accrued Compensation (Details Textual) Details http://www.cohencpa.com/20260331/role/statement-note-13-other-receivables-other-assets-accounts-payable-and-other-liabilities-and-accrued-compensation-tables 74 false false R75.htm 995519 - Disclosure - Note 13 - Other Receivables, Other Assets, Accounts Payable and Other Liabilities, and Accrued Compensation - Other Receivables (Details) Sheet http://www.cohencpa.com/20260331/role/statement-note-13-other-receivables-other-assets-accounts-payable-and-other-liabilities-and-accrued-compensation-other-receivables-details Note 13 - Other Receivables, Other Assets, Accounts Payable and Other Liabilities, and Accrued Compensation - Other Receivables (Details) Details http://www.cohencpa.com/20260331/role/statement-note-13-other-receivables-other-assets-accounts-payable-and-other-liabilities-and-accrued-compensation-tables 75 false false R76.htm 995520 - Disclosure - Note 13 - Other Receivables, Other Assets, Accounts Payable and Other Liabilities, and Accrued Compensation - Other Assets (Details) Sheet http://www.cohencpa.com/20260331/role/statement-note-13-other-receivables-other-assets-accounts-payable-and-other-liabilities-and-accrued-compensation-other-assets-details Note 13 - Other Receivables, Other Assets, Accounts Payable and Other Liabilities, and Accrued Compensation - Other Assets (Details) Details http://www.cohencpa.com/20260331/role/statement-note-13-other-receivables-other-assets-accounts-payable-and-other-liabilities-and-accrued-compensation-tables 76 false false R77.htm 995521 - Disclosure - Note 13 - Other Receivables, Other Assets, Accounts Payable and Other Liabilities, and Accrued Compensation - Accounts Payable and Other Liabilities (Details) Sheet http://www.cohencpa.com/20260331/role/statement-note-13-other-receivables-other-assets-accounts-payable-and-other-liabilities-and-accrued-compensation-accounts-payable-and-other-liabilities-details Note 13 - Other Receivables, Other Assets, Accounts Payable and Other Liabilities, and Accrued Compensation - Accounts Payable and Other Liabilities (Details) Details 77 false false R78.htm 995522 - Disclosure - Note 13 - Other Receivables, Other Assets, Accounts Payable and Other Liabilities, and Accrued Compensation - Accrued Compensation (Details) Sheet http://www.cohencpa.com/20260331/role/statement-note-13-other-receivables-other-assets-accounts-payable-and-other-liabilities-and-accrued-compensation-accrued-compensation-details Note 13 - Other Receivables, Other Assets, Accounts Payable and Other Liabilities, and Accrued Compensation - Accrued Compensation (Details) Details http://www.cohencpa.com/20260331/role/statement-note-13-other-receivables-other-assets-accounts-payable-and-other-liabilities-and-accrued-compensation-tables 78 false false R79.htm 995523 - Disclosure - Note 14 - Variable Interest Entities (Details Textual) Sheet http://www.cohencpa.com/20260331/role/statement-note-14-variable-interest-entities-details-textual Note 14 - Variable Interest Entities (Details Textual) Details http://www.cohencpa.com/20260331/role/statement-note-14-variable-interest-entities-tables 79 false false R80.htm 995524 - Disclosure - Note 14 - Variable Interest Entities - Consolidated VIEs (Details) Sheet http://www.cohencpa.com/20260331/role/statement-note-14-variable-interest-entities-consolidated-vies-details Note 14 - Variable Interest Entities - Consolidated VIEs (Details) Details 80 false false R81.htm 995525 - Disclosure - Note 14 - Variable Interest Entities - Carrying Value of Variable Interests in Non-consolidated Variable Interest Entities (Details) Sheet http://www.cohencpa.com/20260331/role/statement-note-14-variable-interest-entities-carrying-value-of-variable-interests-in-nonconsolidated-variable-interest-entities-details Note 14 - Variable Interest Entities - Carrying Value of Variable Interests in Non-consolidated Variable Interest Entities (Details) Details 81 false false R82.htm 995526 - Disclosure - Note 15 - Debt (Details Textual) Sheet http://www.cohencpa.com/20260331/role/statement-note-15-debt-details-textual Note 15 - 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