Use of Estimates, Policy [Policy Text Block]

B. Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make assumptions and estimates that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Cash and Cash Equivalents, Policy [Policy Text Block]

D. Cash and Cash Equivalents

Cash and cash equivalents consist of cash and short-term, highly liquid investments that have original maturities of three months or less. A portion of the Company’s cash and cash equivalents are in the form of short-term investments and are not held in federally insured bank accounts.

Derivatives, Policy [Policy Text Block]

F. Derivative Financial Instruments

FASB ASC 815, Derivatives and Hedging (“ASC 815”), provides for optional hedge accounting. When a derivative is deemed to be a hedge and certain documentation and effectiveness testing requirements are met, reporting entities can record all or a portion of the change in the fair value of a designated hedge as an adjustment to OCI rather than as a gain or loss in the statements of operations. To date, the Company has not designated any derivatives as hedges under the provisions included in ASC 815.

All of the derivatives that the Company enters into contain master netting arrangements. If certain requirements are met, the offsetting provisions included in FASB ASC 210, Balance Sheet (“ASC 210”), allow (but do not require) the reporting entity to net the derivative asset and liability on the consolidated balance sheets. It is the Company’s policy to present the derivative assets and liabilities on a net basis if the conditions of ASC 210 are met. However, in general the Company does not enter in to offsetting derivatives with the same counterparties. Therefore, in all periods presented, no derivatives are presented on a net basis.

Derivative financial instruments are recorded at fair value. If the derivative was entered into as part of the Company’s broker-dealer operations, it will be included as a component of investments-trading or trading securities sold, not yet purchased. If it is entered into as a hedge for another financial instrument included in other investments, at fair value then the derivative or as a speculative principal investment, it will be included as a component of other investments, at fair value or other investments sold, not yet purchased.

The Company may, from time to time, enter into derivatives to manage its risk exposures arising from (i) fluctuations in foreign currency rates with respect to the Company’s investments in foreign currency denominated investments; (ii) the Company’s investments in interest sensitive investments; (iii) the Company's investments in equities; and (iv) the Company’s facilitation of mortgage-backed trading. Derivatives entered into by the Company, from time to time, may include (a) foreign currency forward contracts; (b) purchase and sale agreements of TBAs and other forward agency MBS contracts; and (c) other extended settlement trades.

TBAs are forward contracts to purchase or sell MBS whose collateral remain “to be announced” until just prior to the trade settlement. In addition to TBAs, the Company sometimes enters into forward purchases or sales of agency MBS where the underlying collateral has been identified. These transactions are referred to as other forward agency MBS contracts. TBAs and other forward agency MBS contracts are accounted for as derivatives by the Company under ASC 815. The settlement of these transactions is not expected to have a material effect on the Company’s consolidated financial statements.

In addition to TBAs and other forward agency MBS contracts as part of the Company’s broker-dealer operations, the Company may from time to time enter into other securities or loan trades that do not settle within the normal securities settlement period. In those cases, the purchase or sale of the security or loan is not recorded until the settlement date. However, from the trade date until the settlement date, the Company’s interest in the security is accounted for as a derivative as either a forward purchase commitment or forward sale commitment. The Company will classify the related derivative either within investments-trading or other investments, at fair value depending on where it intends to classify the investment once the trade settles.

Derivatives involve varying degrees of off-balance sheet risk, whereby changes in the level or volatility of interest rates or market values of the underlying financial instruments may result in changes in the value of a particular financial instrument in excess of its carrying amount. Depending on the Company’s investment strategy, realized and unrealized gains and losses are recognized in principal transactions and other income or in net trading in the Company’s consolidated statements of operations on a trade date basis. See note 10.

Property, Plant and Equipment, Policy [Policy Text Block]

H. Furniture, Equipment, and Leasehold Improvements, Net

Furniture, equipment, and leasehold improvements are stated at cost, less accumulated depreciation and amortization, and are included as a component of other assets in the consolidated balance sheets. Furniture and equipment are depreciated on a straight-line basis over their estimated useful life of 3 to 5 years. Leasehold improvements are amortized over the lesser of their useful life or lease term, which generally ranges from 5 to 10 years. See note 16.

Consolidation, Variable Interest Entity, Policy [Policy Text Block]

J. Variable Interest Entities

ASC 810 contains the guidance surrounding the definition of a VIE, the definition of variable interests, and the consolidation rules surrounding VIEs. In general, VIEs are entities in which equity investors lack the characteristics of a controlling financial interest or do not have sufficient equity at risk for the entity to finance its activities without additional subordinated financial support. The Company has variable interests in VIEs through its management contracts and investments in various securitization entities including CLOs and CDOs.

Once it is determined that the Company holds a variable interest in a VIE, ASC 810 requires that the Company perform a qualitative analysis to determine (i) which entity has the power to direct the matters that most significantly impact the VIE’s financial performance and (ii) if the Company has the obligation to absorb the losses of the VIE that could potentially be significant to the VIE or the right to receive the benefits of the VIE that could potentially be significant to the VIE. The entity that has both of these characteristics is deemed to be the primary beneficiary and required to consolidate the VIE. This assessment must be done on an ongoing basis. The Company has included the required disclosures for VIEs in its consolidated financial statements. See note 18 for further details.

Debt, Policy [Policy Text Block]

L. Debt

Debt is recorded at its face amount, less any discount or plus any premium. Debt issuance costs are included as a component of discount on debt. Any discount on debt is amortized as a component of interest expense using the effective interest method. The Company has not elected to account for any of its debt at fair value under ASC 825. See note 20.

Revenue [Policy Text Block]

N. Revenue Recognition

Net trading

Net trading includes: (i) all gains, losses, interest income, dividend income, and interest expense from securities classified as investments-trading and trading securities sold, not yet purchased; (ii) interest income and expense from collateralized securities transactions; and (iii) commissions and riskless trading profits. Net trading is reduced by margin interest, which is recorded on an accrual basis. Riskless trades are transacted through the Company’s proprietary account with a customer order in hand, resulting in little or no market risk to the Company. Transactions that settle in the regular way are recognized on a trade date basis. Extended settlement transactions are recognized on a settlement date basis (although in cases of extended settlement trades, the unsettled trade is accounted for as a derivative between trade and settlement date). See note 10. The investments classified as trading (both investments-trading and trading securities sold, not yet purchased) are carried at fair value. The determination of fair value is based on quoted market prices of an active exchange, independent broker market quotations, market price quotations from third-party pricing services or, when independent broker quotations or market price quotations from third-party pricing services are unavailable, valuation models prepared by the Company’s management. The models include estimates, and the valuations derived from them could differ materially from amounts realizable in an open market exchange. See note 9.

Asset management

Asset management revenue consists of management fees earned from Investment Vehicles. In the case of CDOs, the fees earned by the Company generally consist of senior, subordinated, and incentive fees. The senior asset management fee is generally senior to all the securities in the CDO capital structure and is recognized on a monthly basis as services are performed. The senior asset management fee is generally paid on a quarterly basis. The subordinated asset management fee is an additional payment for the same services but has a lower priority in the CDO cash flows. If the CDO experiences a certain level of asset defaults and deferrals, these fees may not be paid. There is no recovery by the CDO of previously paid subordinated asset management fees. It is the Company’s policy to recognize these fees on a monthly basis as services are performed. The subordinated asset management fee is generally paid on a quarterly basis. However, if the Company determines that the subordinated asset management fee will not be paid (which generally occurs on the quarterly payment date), the Company will stop recognizing additional subordinated asset management fees on that particular CDO and will reverse any subordinated asset management fees that are accrued and unpaid. The Company will begin accruing the subordinated asset management fee again if payment resumes and, in management’s estimate, continued payment is reasonably assured. If payment were to resume but the Company was unsure of continued payment, it would recognize the subordinated asset management fee as payments were received and would not accrue such fees on a monthly basis. The incentive management fee is an additional payment, made typically after five to seven years of the life of a CDO, which is based on the clearance of an accumulated cash return on investment (“Hurdle Return”) received by the most junior CDO securities holders. It is an incentive for the Company to perform in its role as asset manager by minimizing defaults and maximizing recoveries. The incentive management fee is not ultimately determined or payable until the achievement of the Hurdle Return by the most junior CDO securities holders. The Company recognizes incentive fee revenue when it is probable and there is not a significant chance of reversal in the future.

In the case of Investment Vehicles other than CDOs, generally the Company earns a base fee and, in some cases, also earns an incentive fee. Base fees will generally be recognized on a monthly basis as services are performed and will be paid monthly or quarterly. The contractual terms of each arrangement will determine the Company’s revenue recognition policy for incentive fees in each case. However, in all cases the Company recognizes the incentive fees when they are probable and there is not a significant chance of reversal in the future.

New issue and advisory

New issue and advisory revenue includes: (i) new issue revenue associated with originating, arranging, or placing newly created financial instruments and (ii) revenue from advisory services. New issue and advisory revenue is recognized when all services have been provided and payment is earned.

Principal transactions and other income

Principal transactions include all gains, losses, and income from financial instruments classified as other investments, at fair value and other investments sold, not yet purchased in the consolidated balance sheets.

Investments classified as other investments, at fair value and other investments sold, not yet purchased are carried at fair value. The determination of fair value is based on quoted market prices of an active exchange, independent broker market quotations, market price quotations or models from third-party pricing services, or, when independent broker quotations or market price quotations or models from third-party pricing services are unavailable, valuation models prepared by the Company’s management. These models include estimates, and the valuations derived from them could differ materially from amounts realizable in an open market exchange. Dividend income is recognized on the ex-dividend date.

Other income /(loss) includes foreign currency gains and losses, interest earned on cash and cash equivalents, interest earned and losses incurred on notes receivable, and other miscellaneous income including revenue from revenue sharing arrangements.

Lessee, Leases [Policy Text Block]

P. Leases

The Company leases office space, certain computer and related equipment and a vehicle under a noncancelable operating lease. From time to time, the Company sub-leases office space to other tenants. Under the requirements of ASC 842, the company determines if an arrangement is a lease at the inception date of the contract. The Company measures operating lease liabilities using an estimated incremental borrowing rate as there is no rate implicit in the Company’s operating lease arrangements. An incremental borrowing rate was calculated for each operating lease based on the term of the lease, the U.S. Treasury term interest rate, and an estimated spread to borrow on a secured basis. During the periods presented, all leases to which the Company was a party are classified as operating leases and rent expense was recognized on a straight-line basis and included as a component of business development, occupancy, and equipment in the consolidated statements of operations.

Share-based Payment Arrangement [Policy Text Block]

R. Equity-Based Compensation

The Company accounts for equity-based compensation issued to its employees using the fair value-based methodology prescribed by the provisions related to share-based payments included in FASB ASC 718, Compensation-Stock Compensation (“ASC 718”). In the periods presented herein, the Company has had three different types of grants that fall under ASC 718.

First, the Company sometimes grant to employees and directors restricted common stock in Cohen & Company Inc. These grants vest over a period of time and only have service based vesting criteria. In these cases, the Company determines the fair value of the grants by taking the closing stock price of Cohen & Company, Inc. on the grant date and multiplying it by the number of restricted shares granted. The recipient is entitled to dividends during the vesting period but they are paid only if (and to the extent) the restricted share grant ultimately vests. Any dividends paid for periods prior to vesting are treated as compensation expense. The Company recognizes the expense over the service period on a straight line basis. The Company assumes no forfeitures up front and records forfeitures as they occur by reducing expense.

Second, the Company sometimes grants to employees operating units of the Operating LLC. These grants also vest over a period of time and only have service based vesting criteria. Because there is a fixed exchange ratio between units of the Operating LLC and shares of Cohen & Company Inc., the fair value of the grant is calculated by taking the closing stock price of Cohen & Company, Inc. on the grant date, adjusting for the exchange ratio, and then multiplying by the number of units of the Operating LLC granted. The recipient is entitled to distributions during the vesting period but they are paid only if (and to the extent) the unit grant ultimately vests. Any distributions paid for periods prior to vesting are treated as compensation expense. The Company recognizes the expense over the service period on a straight line basis. The Company assumes no forfeitures up front and record forfeitures as they occur by reducing expense.

Third, employees sometimes invest in the membership interests of consolidated SPAC sponsor entities. Because these entities are consolidated and the employees are investing in the consolidated company's non-controlling interest, these equity interests fall under ASC 718. Generally, the employee invests a de-minimus amount and receives an allocation of the founder shares held by the sponsor entity. The investment generally does not have any explicit vesting criteria associated with it. Generally, the employee's investment will be worthless if the SPAC in which the sponsor entity has invested is liquidated and it will become worth something if the SPAC completes its business combination. Therefore, the Company treats these grants as having a performance condition (i.e. the completion of the SPAC business combination). Further, at the time of the investments, the Company treats this performance condition as being non-probable. The effect of this is that the Company records no expense related to these investments until (and only if) the business combination is completed. Upon completion of the business combination, the Company records compensation expense in an amount equal to the fair value of the grant. The fair value of the grant is equal to the public trading price of the SPAC on the date of the grant adjusted for certain sale restrictions imposed on the shares the employee receives (generally, the shares are restricted for sale for some time period and subject to certain hurdle prices before they become freely tradeable). The Company uses a Monte Carlo simulation model to determine the appropriate discount to place on shares that are subject to hurdle prices. The compensation amount is recorded with an offsetting credit to non-controlling interest. From that point forward, the shares received by the employee are treated as part of the non-controlling interest and allocated income, expense, gains, and losses accordingly until the applicable sponsor entity is liquidated or otherwise de-consolidated.

Comprehensive Income, Policy [Policy Text Block]

T. Other Comprehensive Income / (Loss)

The Company reports the components of comprehensive income / (loss) within the consolidated statements of operations and comprehensive income / (loss). Comprehensive income / (loss) includes net income / (loss) from foreign translation adjustment.

Concentration Risk, Credit Risk, Policy [Policy Text Block]

V. Business Concentration

A significant portion of the Company’s asset management revenues in a year may be derived from a small number of transactions. For the year ended December 31, 2021, the Company earned asset management revenue of $2,484 from CDOs and $8,438 from other investment funds.

Other than revenue earned in its matched book repo operations, the Company’s trading revenue is generated from transactions with a diverse set of institutional customers. The Company does not consider its trading revenue, other than revenue earned in its matched book repo operations, to be concentrated from a customer or counterparty perspective. See note 11 for discussion of concentrations within its matched book repo operations.

Investments in Special Purpose Acquisition Companies ("SPACs") Sponsor Entitles [Policy Text Block]

X. Investments in Special Purpose Acquisition Companies ("SPACs") Sponsor Entities

The Company invests in the sponsor entities of SPACs. The sponsor entities are limited liability companies (each an "LLC") that pool their members' interests and invest in the private placement of a SPAC. The SPAC will also raise funds in a public offering and seek to complete a business combination within an agreed upon time frame. The SPAC will use the proceeds raised from the private placement to pay transaction and operating expenses during the period it is seeking a business combination. The proceeds of the public offering are placed in an interest bearing trust and can only be used to complete the business combination. Generally, the public investors must approve any business combination prior to its effectiveness. If a business combination is not completed within the agreed upon time frame, the SPAC will liquidate and return the public investors' investment to them. If there are funds remaining after liquidation, the sponsor entities may receive some portion of their investment back, but likely they will suffer a total loss of their investment. If the business combination is completed, the sponsor entities private placement in the SPAC will entitle them to a combination of unrestricted common, restricted common, and (in some cases) warrants of the post-business combination SPAC (which is a publicly traded company). The following summarizes the Company's accounting policies related to its investments in these entities:

•	The sponsor entities are LLCs that give all important decision making rights to their respective managing member. Furthermore, the other members of the LLC cannot replace the managing member. Accordingly, the Company has concluded that the sponsor entities are VIEs and the managing member has the power to direct its most important economic activities. In all cases where the Company is the managing member of a sponsor entity, it has also had a significant economic interest in such sponsor entity and therefore consolidates such sponsor entity.
•	In all cases where the Company has consolidated a sponsor entity, it has determined that the sponsor entity's private placement investment in the SPAC which it sponsors should be treated as an equity method investment during the SPAC's pre-business combination period. Furthermore, because of the difficulty of determining the fair value of such an investment in the SPAC's pre-business combination period, the Company has chosen to not elect fair value option.
•	If a SPAC completes its business combination, the sponsor entity's investment in the SPAC will be converted to a combination of unrestricted and restricted shares in the post-business combination SPAC. At this point (assuming the Company consolidates the sponsor entity), the Company will account for the shares received at fair value. It will reclassify any remaining equity method investment to other investments, at fair value and record principal transactions income for the difference. The Company will record non-controlling interest expense for the SPAC shares that are distributable to the non-controlling interest holders of the sponsor entity. The fair value of the unrestricted shares received is equal to the public trading price of the SPAC on the date of the business combination. The fair value of the restricted shares received is adjusted downwards from the public trading price for certain sale restrictions imposed (generally, they are restricted for sale for some time period and subject to certain hurdle prices before they become freely tradeable). The Company uses a Monte Carlo simulation model to determine the appropriate discount to place on shares that are subject to hurdle prices. In the case of a SPAC business combination where the Company consolidates the sponsor entity, generally there is also an equity-based compensation entry to be recorded at the date of the business combination. See equity-based compensation section above. The Company will continue to mark the sponsor entity's investment in the SPAC to market and record principal transactions income or loss and offsetting non-controlling interest income or expense until the sponsor entity itself distributes all of the SPAC shares it owns to its members and liquidates. At that point, the Company will hold the SPAC shares directly (rather than through a consolidated subsidiary) and will record principal transaction income and loss until the SPAC shares themselves are liquidated.
•	The Company will also invest in sponsor entities that it does not consolidate because it is not the managing member of such sponsor entity or otherwise does not have the power to direct the sponsor entity's most important activities. In these cases, the Company treats its investment in the sponsor entity as an equity method investment. Furthermore, because of the difficulty of determining the fair value of such an investment in the applicable SPAC's pre-business combination period, the Company has chosen to not elect fair value option.
•	If a SPAC completes a business combination and the Company has an equity method investment in the associated sponsor entity, upon completing a business combination, the sponsor entity will record income equal to the difference between the fair value of the restricted and unrestricted shares it receives and the carrying value of its equity method investment in the SPAC. The Company will recognize its share of this gain as income from equity method affiliates. The sponsor entity will continue to mark its investment in the SPAC to market after the business combination and the Company will recognize its share of the change in fair value as income or loss from equity method affiliates. Once the sponsor entity distributes the Company's share of the SPAC shares it owns, the Company will reclassify its investment from investment in equity method affiliate to other investments, at fair value as the Company will hold the SPAC shares directly (rather than through an equity method investee). The Company will then record principal transactions income and loss until the SPAC shares themselves are liquidated.
•	If a SPAC liquidates and the Company has an investment in it (either directly in the case of consolidated sponsor entities or indirectly in the case of equity method sponsor entities), the Company will write off its remaining equity method balance and record loss on equity method investment. In the case of consolidated sponsor entities, the Company will also record an offsetting entry to non-controlling interest.