v3.26.1
Note 8 - Fair Value Disclosures - Fair Value Measurements on a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Total investments - trading $ 173,064 $ 140,576
Avax One Technology Ltd. 80,205 57,258
Total trading securities sold, not yet purchased 48,932 36,617
Other investments, sold not yet purchased 80 0
Other investments, at fair value 80,205 57,258
Cohen & Company Capital Markets (CCM) [Member]    
Avax One Technology Ltd. 63,162 34,208
Other investments, at fair value 63,162 34,208
Non CCM [Member]    
Avax One Technology Ltd. 17,043 23,050
Other investments, at fair value 17,043 23,050
Fair Value, Recurring [Member]    
Total investments - trading 173,064 140,576
Avax One Technology Ltd. 80,205 57,258
Total trading securities sold, not yet purchased 48,932 36,617
Other investments, sold not yet purchased 80  
Other investments, at fair value 80,205 57,258
Fair Value, Recurring [Member] | Cohen & Company Capital Markets (CCM) [Member]    
Avax One Technology Ltd. 63,162 34,208
Other investments, at fair value 63,162 34,208
Fair Value, Recurring [Member] | Cohen & Company Capital Markets (CCM) [Member] | Avax One Technology [Member]    
Avax One Technology Ltd. 390 1,363
Other investments, at fair value 390 1,363
Fair Value, Recurring [Member] | Cohen & Company Capital Markets (CCM) [Member] | Critical Metals Corp [Member]    
Avax One Technology Ltd. 2,481 1,506
Other investments, at fair value 2,481 1,506
Fair Value, Recurring [Member] | Cohen & Company Capital Markets (CCM) [Member] | Nakamoto Inc [Member]    
Avax One Technology Ltd.   1,802
Other investments, at fair value   1,802
Fair Value, Recurring [Member] | Cohen & Company Capital Markets (CCM) [Member] | Namib Minerals [Member]    
Avax One Technology Ltd. 1,082 2,779
Other investments, at fair value 1,082 2,779
Fair Value, Recurring [Member] | Cohen & Company Capital Markets (CCM) [Member] | OceanPal Inc [Member]    
Avax One Technology Ltd.   2,930
Other investments, at fair value   2,930
Fair Value, Recurring [Member] | Cohen & Company Capital Markets (CCM) [Member] | ProCap Financials Inc [Member]    
Avax One Technology Ltd. 647 1,521
Other investments, at fair value 647 1,521
Fair Value, Recurring [Member] | Cohen & Company Capital Markets (CCM) [Member] | Bakkt Inc [Member]    
Avax One Technology Ltd. 976  
Other investments, at fair value 976  
Fair Value, Recurring [Member] | Cohen & Company Capital Markets (CCM) [Member] | USBC Inc [Member]    
Avax One Technology Ltd.   2,482
Other investments, at fair value   2,482
Fair Value, Recurring [Member] | Cohen & Company Capital Markets (CCM) [Member] | Hadron Energy Inc [Member]    
Avax One Technology Ltd. 265  
Other investments, at fair value 265  
Fair Value, Recurring [Member] | Non CCM [Member]    
Avax One Technology Ltd. 17,043 23,050
Other investments, at fair value 17,043 23,050
Fair Value, Recurring [Member] | Non CCM [Member] | ProCap Financials Inc [Member]    
Avax One Technology Ltd. 3,314 7,595
Other investments, at fair value 3,314 7,595
Fair Value, Recurring [Member] | Non CCM [Member] | Payoneer [Member]    
Avax One Technology Ltd. 1,997  
Other investments, at fair value 1,997  
Fair Value, Recurring [Member] | Residential Mortgage-Backed Securities [Member]    
Total investments - trading 3 3
Fair Value, Recurring [Member] | SBA Loans [Member]    
Total investments - trading 34,710 43,090
Fair Value, Recurring [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Total investments - trading 59,248 42,471
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Total investments - trading 20,116 17,675
Total trading securities sold, not yet purchased 31  
Fair Value, Recurring [Member] | US Treasury Securities [Member]    
Total investments - trading 40,915 23,802
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Total investments - trading 155,655 130,207
Total trading securities sold, not yet purchased 7,986 12,352
Other investments, sold not yet purchased 80  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cohen & Company Capital Markets (CCM) [Member]    
Avax One Technology Ltd. 60,557 22,854
Other investments, at fair value 60,557 22,854
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cohen & Company Capital Markets (CCM) [Member] | Avax One Technology [Member]    
Avax One Technology Ltd. 0 0
Other investments, at fair value 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cohen & Company Capital Markets (CCM) [Member] | Critical Metals Corp [Member]    
Avax One Technology Ltd. 2,481 1,506
Other investments, at fair value 2,481 1,506
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cohen & Company Capital Markets (CCM) [Member] | Nakamoto Inc [Member]    
Avax One Technology Ltd.   0
Other investments, at fair value   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cohen & Company Capital Markets (CCM) [Member] | Namib Minerals [Member]    
Avax One Technology Ltd. 1,082 2,779
Other investments, at fair value 1,082 2,779
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cohen & Company Capital Markets (CCM) [Member] | OceanPal Inc [Member]    
Avax One Technology Ltd.   0
Other investments, at fair value   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cohen & Company Capital Markets (CCM) [Member] | ProCap Financials Inc [Member]    
Avax One Technology Ltd. 0 0
Other investments, at fair value 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cohen & Company Capital Markets (CCM) [Member] | Bakkt Inc [Member]    
Avax One Technology Ltd. 0  
Other investments, at fair value 0  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cohen & Company Capital Markets (CCM) [Member] | USBC Inc [Member]    
Avax One Technology Ltd.   0
Other investments, at fair value   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cohen & Company Capital Markets (CCM) [Member] | Hadron Energy Inc [Member]    
Avax One Technology Ltd. 0  
Other investments, at fair value 0  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Non CCM [Member] | ProCap Financials Inc [Member]    
Avax One Technology Ltd. 0 0
Other investments, at fair value 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Non CCM [Member] | Payoneer [Member]    
Avax One Technology Ltd. 1,997  
Other investments, at fair value 1,997  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential Mortgage-Backed Securities [Member]    
Total investments - trading 3 3
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | SBA Loans [Member]    
Total investments - trading 34,710 43,090
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Total investments - trading 59,248 42,471
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member]    
Total investments - trading 20,116 17,675
Total trading securities sold, not yet purchased 31  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Total investments - trading 17,409 10,369
Total trading securities sold, not yet purchased 40,946 24,265
Other investments, sold not yet purchased 0  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Cohen & Company Capital Markets (CCM) [Member]    
Avax One Technology Ltd. 2,605 11,354
Other investments, at fair value 2,605 11,354
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Cohen & Company Capital Markets (CCM) [Member] | Avax One Technology [Member]    
Avax One Technology Ltd. 390 1,363
Other investments, at fair value 390 1,363
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Cohen & Company Capital Markets (CCM) [Member] | Critical Metals Corp [Member]    
Avax One Technology Ltd. 0 0
Other investments, at fair value 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Cohen & Company Capital Markets (CCM) [Member] | Nakamoto Inc [Member]    
Avax One Technology Ltd.   1,802
Other investments, at fair value   1,802
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Cohen & Company Capital Markets (CCM) [Member] | Namib Minerals [Member]    
Avax One Technology Ltd. 0 0
Other investments, at fair value 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Cohen & Company Capital Markets (CCM) [Member] | OceanPal Inc [Member]    
Avax One Technology Ltd.   2,930
Other investments, at fair value   2,930
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Cohen & Company Capital Markets (CCM) [Member] | ProCap Financials Inc [Member]    
Avax One Technology Ltd. 647 1,521
Other investments, at fair value 647 1,521
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Cohen & Company Capital Markets (CCM) [Member] | Bakkt Inc [Member]    
Avax One Technology Ltd. 976  
Other investments, at fair value 976  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Cohen & Company Capital Markets (CCM) [Member] | USBC Inc [Member]    
Avax One Technology Ltd.   2,482
Other investments, at fair value   2,482
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Cohen & Company Capital Markets (CCM) [Member] | Hadron Energy Inc [Member]    
Avax One Technology Ltd. 265  
Other investments, at fair value 265  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Non CCM [Member] | ProCap Financials Inc [Member]    
Avax One Technology Ltd. 3,314 7,595
Other investments, at fair value 3,314 7,595
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Non CCM [Member] | Payoneer [Member]    
Avax One Technology Ltd. 0  
Other investments, at fair value 0  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member]    
Total investments - trading 40,915 23,802
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Other investments, sold not yet purchased 0  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Cohen & Company Capital Markets (CCM) [Member]    
Avax One Technology Ltd. 0
Other investments, at fair value 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Cohen & Company Capital Markets (CCM) [Member] | Avax One Technology [Member]    
Avax One Technology Ltd. 0 0
Other investments, at fair value 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Cohen & Company Capital Markets (CCM) [Member] | Critical Metals Corp [Member]    
Avax One Technology Ltd. 0 0
Other investments, at fair value 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Cohen & Company Capital Markets (CCM) [Member] | Nakamoto Inc [Member]    
Avax One Technology Ltd.   0
Other investments, at fair value   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Cohen & Company Capital Markets (CCM) [Member] | Namib Minerals [Member]    
Avax One Technology Ltd. 0 0
Other investments, at fair value 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Cohen & Company Capital Markets (CCM) [Member] | OceanPal Inc [Member]    
Avax One Technology Ltd.   0
Other investments, at fair value   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Cohen & Company Capital Markets (CCM) [Member] | ProCap Financials Inc [Member]    
Avax One Technology Ltd. 0 0
Other investments, at fair value 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Cohen & Company Capital Markets (CCM) [Member] | Bakkt Inc [Member]    
Avax One Technology Ltd. 0  
Other investments, at fair value 0  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Cohen & Company Capital Markets (CCM) [Member] | USBC Inc [Member]    
Avax One Technology Ltd.   0
Other investments, at fair value   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Cohen & Company Capital Markets (CCM) [Member] | Hadron Energy Inc [Member]    
Avax One Technology Ltd. 0  
Other investments, at fair value 0  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Non CCM [Member] | ProCap Financials Inc [Member]    
Avax One Technology Ltd. 0 0
Other investments, at fair value 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Non CCM [Member] | Payoneer [Member]    
Avax One Technology Ltd. 0  
Other investments, at fair value 0  
Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Non CCM [Member]    
Avax One Technology Ltd. [1] 10,725 12,486
Other investments, at fair value [1] 10,725 12,486
Corporate Bonds and Redeemable Preferred Stock [Member]    
Total investments - trading 35,768 18,449
Total trading securities sold, not yet purchased 2,536 8,107
Corporate Bonds and Redeemable Preferred Stock [Member] | Fair Value, Recurring [Member]    
Total investments - trading 35,768 18,449
Avax One Technology Ltd. 2,536 8,107
Other investments, at fair value 2,536 8,107
Corporate Bonds and Redeemable Preferred Stock [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Total investments - trading 35,768 18,449
Avax One Technology Ltd. 2,536 8,107
Other investments, at fair value 2,536 8,107
Derivative [Member]    
Total investments - trading 4,802 4,651
Total trading securities sold, not yet purchased 5,419 4,245
Derivative [Member] | Fair Value, Recurring [Member]    
Total investments - trading 4,802 4,651
Total trading securities sold, not yet purchased 5,419 4,245
Derivative [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Total investments - trading 4,802 4,651
Total trading securities sold, not yet purchased 5,419 4,245
Equity Securities [Member]    
Total investments - trading 17,468 10,424
Total trading securities sold, not yet purchased 31 463
Equity Securities [Member] | Fair Value, Recurring [Member]    
Total investments - trading 17,468 10,424
Avax One Technology Ltd. 31 463
Other investments, at fair value 31 463
Equity Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Total investments - trading 59 55
Avax One Technology Ltd. 0 0
Other investments, at fair value 0 0
Equity Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Total investments - trading 17,409 10,369
Avax One Technology Ltd. 31 463
Other investments, at fair value 31 463
Municipal Bonds [Member]    
Total investments - trading 949 3,813
Municipal Bonds [Member] | Fair Value, Recurring [Member]    
Total investments - trading 949 3,813
Municipal Bonds [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Total investments - trading 949 3,813
Placement Unit and Warrants [Member] | Cohen & Company Capital Markets (CCM) [Member]    
Avax One Technology Ltd. 56,990 18,492
Other investments, at fair value 56,990 18,492
Placement Unit and Warrants [Member] | Fair Value, Recurring [Member] | Cohen & Company Capital Markets (CCM) [Member]    
Avax One Technology Ltd. 56,990 18,492
Other investments, at fair value 56,990 18,492
Placement Unit and Warrants [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cohen & Company Capital Markets (CCM) [Member]    
Avax One Technology Ltd. 56,990 18,492
Other investments, at fair value 56,990 18,492
Placement Unit and Warrants [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Cohen & Company Capital Markets (CCM) [Member]    
Avax One Technology Ltd. 0 0
Other investments, at fair value 0 0
Placement Unit and Warrants [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Cohen & Company Capital Markets (CCM) [Member]    
Avax One Technology Ltd. 0 0
Other investments, at fair value 0 0
Other Long-Term Investments [Member] | Cohen & Company Capital Markets (CCM) [Member]    
Avax One Technology Ltd. 331 1,333
Other investments, at fair value 331 1,333
Other Long-Term Investments [Member] | Non CCM [Member]    
Avax One Technology Ltd. 1,007 2,969
Other investments, at fair value 1,007 2,969
Other Long-Term Investments [Member] | Fair Value, Recurring [Member] | Cohen & Company Capital Markets (CCM) [Member]    
Avax One Technology Ltd. 331 1,333
Other investments, at fair value 331 1,333
Other Long-Term Investments [Member] | Fair Value, Recurring [Member] | Non CCM [Member]    
Avax One Technology Ltd. 1,007 2,969
Other investments, at fair value 1,007 2,969
Other Long-Term Investments [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cohen & Company Capital Markets (CCM) [Member]    
Avax One Technology Ltd. 4 77
Other investments, at fair value 4 77
Other Long-Term Investments [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Non CCM [Member]    
Avax One Technology Ltd. 510 2,087
Other investments, at fair value 510 2,087
Other Long-Term Investments [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Cohen & Company Capital Markets (CCM) [Member]    
Avax One Technology Ltd. 327 1,256
Other investments, at fair value 327 1,256
Other Long-Term Investments [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Non CCM [Member]    
Avax One Technology Ltd. 497 882
Other investments, at fair value 497 882
Other Long-Term Investments [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Cohen & Company Capital Markets (CCM) [Member]    
Avax One Technology Ltd. 0 0
Other investments, at fair value 0 0
Other Long-Term Investments [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Non CCM [Member]    
Avax One Technology Ltd. 0 0
Other investments, at fair value 0 0
Excluding NAV [Member] | Fair Value, Recurring [Member] | Non CCM [Member]    
Avax One Technology Ltd.   10,564
Other investments, at fair value   10,564
Excluding NAV [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Non CCM [Member]    
Avax One Technology Ltd.   2,087
Other investments, at fair value   2,087
Excluding NAV [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Non CCM [Member]    
Avax One Technology Ltd.   8,477
Other investments, at fair value   8,477
Excluding NAV [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Non CCM [Member]    
Avax One Technology Ltd.   0
Other investments, at fair value   0
Public Companies and Other [Member] | Fair Value, Recurring [Member] | Non CCM [Member]    
Avax One Technology Ltd. 6,318  
Other investments, at fair value 6,318  
Public Companies and Other [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Non CCM [Member]    
Avax One Technology Ltd. 2,507  
Other investments, at fair value 2,507  
Public Companies and Other [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Non CCM [Member]    
Avax One Technology Ltd. 3,811  
Other investments, at fair value 3,811  
Public Companies and Other [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Non CCM [Member]    
Avax One Technology Ltd. 0  
Other investments, at fair value 0  
Equity Derivatives [Member]    
Other investments, sold not yet purchased 80 $ 0
Equity Derivatives [Member] | Fair Value, Recurring [Member]    
Avax One Technology Ltd. 80  
Other investments, at fair value 80  
Equity Derivatives [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Avax One Technology Ltd. 80  
Other investments, at fair value $ 80  
[1] As a practical expedient, the Company uses NAV (or its equivalent) to measure the fair value of its investments in U.S. Insurance JV, CREO JV, and CK Capital Value Fund. U.S. Insurance JV invests in U.S. Dollar ("USD") denominated debt issued by small insurance and reinsurance companies. CREO JV invests primarily in multi-family commercial real estate mortgage-backed loans. CK Capital Value Fund invests primarily in office buildings in the Netherlands. According to ASC 820, these investments are not categorized within the valuation hierarchy.