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Note 8 - Fair Value Disclosures - Fair Value Measurements on a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Investments-trading $ 122,979 $ 181,328
Total other investments, at fair value 40,331 72,217
Trading securities sold, not yet purchased 47,719 65,751
Other investments, sold not yet purchased 7,590 24,742
US Government Agencies Debt Securities [Member]    
Trading securities sold, not yet purchased 1 0
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Trading securities sold, not yet purchased 95 0
US Treasury Securities [Member]    
Trading securities sold, not yet purchased 24,445 34,284
Residential Mortgage [Member]    
Total other investments, at fair value 284 132
Certificates of Deposit [Member]    
Investments-trading 216 0
Corporate Bonds and Redeemable Preferred Stock [Member]    
Investments-trading 48,197 53,657
Trading securities sold, not yet purchased 22,673 24,355
Derivative [Member]    
Investments-trading 1,438 7,470
Trading securities sold, not yet purchased 438 6,719
Equity Securities [Member]    
Investments-trading 930 928
Total other investments, at fair value 8,372 38,038
Trading securities sold, not yet purchased 67 393
Other investments, sold not yet purchased 580 97
Municipal Bonds [Member]    
Investments-trading 17,169 20,572
Equity Derivatives [Member]    
Total other investments, at fair value 876 1,447
Fair Value Receivables [Member]    
Total other investments, at fair value 8,821 9,541
Interest In SPVs [Member]    
Total other investments, at fair value 2,629 12,609
Share Forward Liabilities [Member]    
Other investments, sold not yet purchased 7,010 24,645
Fair Value, Recurring [Member]    
Investments-trading 122,979 181,328
Total other investments, at fair value 40,331 72,217
Trading securities sold, not yet purchased 47,719 65,751
Other investments, sold not yet purchased 7,590 24,742
Fair Value, Recurring [Member] | Residential Mortgage Loans [Member]    
Investments-trading 1,542 3,113
Fair Value, Recurring [Member] | Residential Mortgage-Backed Securities [Member]    
Investments-trading 7 9
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Investments-trading 10,678 6,567
Trading securities sold, not yet purchased 1 0
Fair Value, Recurring [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Investments-trading 42,547 88,000
Trading securities sold, not yet purchased 95 0
Fair Value, Recurring [Member] | US Treasury Securities [Member]    
Investments-trading 255 1,012
Trading securities sold, not yet purchased 24,445 34,284
Fair Value, Recurring [Member] | Residential Mortgage [Member]    
Total other investments, at fair value 284 132
Fair Value, Recurring [Member] | Total Investments not Measured at NAV [Member]    
Total other investments, at fair value 32,394 64,327
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Investments-trading 1,185 1,651
Trading securities sold, not yet purchased 24,512 34,677
Other investments, sold not yet purchased 130 97
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Residential Mortgage Loans [Member]    
Investments-trading 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Residential Mortgage-Backed Securities [Member]    
Investments-trading 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Government Agencies Debt Securities [Member]    
Investments-trading 0 0
Trading securities sold, not yet purchased 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Investments-trading 0 0
Trading securities sold, not yet purchased 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member]    
Investments-trading 255 1,012
Trading securities sold, not yet purchased 24,445 34,284
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Residential Mortgage [Member]    
Total other investments, at fair value 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Total Investments not Measured at NAV [Member]    
Total other investments, at fair value 16,946 38,038
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Investments-trading 121,794 179,677
Trading securities sold, not yet purchased 23,207 31,074
Other investments, sold not yet purchased 7,460 24,645
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential Mortgage Loans [Member]    
Investments-trading 1,542 3,113
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential Mortgage-Backed Securities [Member]    
Investments-trading 7 9
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member]    
Investments-trading 10,678 6,567
Trading securities sold, not yet purchased 1 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Investments-trading 42,547 88,000
Trading securities sold, not yet purchased 95 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member]    
Investments-trading 0 0
Trading securities sold, not yet purchased 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential Mortgage [Member]    
Total other investments, at fair value 284 132
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Total Investments not Measured at NAV [Member]    
Total other investments, at fair value 15,448 26,289
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Investments-trading 0 0
Trading securities sold, not yet purchased 0 0
Other investments, sold not yet purchased 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Residential Mortgage Loans [Member]    
Investments-trading 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Residential Mortgage-Backed Securities [Member]    
Investments-trading 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Government Agencies Debt Securities [Member]    
Investments-trading 0 0
Trading securities sold, not yet purchased 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Investments-trading 0 0
Trading securities sold, not yet purchased 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member]    
Investments-trading 0 0
Trading securities sold, not yet purchased 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Residential Mortgage [Member]    
Total other investments, at fair value 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Total Investments not Measured at NAV [Member]    
Total other investments, at fair value 0 0
Fair Value, Recurring [Member] | Fair Value Measured at Net Asset Value Per Share [Member]    
Total other investments, at fair value 7,937 [1] 7,890 [2]
Fair Value, Recurring [Member] | Certificates of Deposit [Member]    
Investments-trading 216  
Fair Value, Recurring [Member] | Certificates of Deposit [Member] | Fair Value, Inputs, Level 1 [Member]    
Investments-trading 0  
Fair Value, Recurring [Member] | Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]    
Investments-trading 216  
Fair Value, Recurring [Member] | Certificates of Deposit [Member] | Fair Value, Inputs, Level 3 [Member]    
Investments-trading 0  
Fair Value, Recurring [Member] | Corporate Bonds and Redeemable Preferred Stock [Member]    
Investments-trading 48,197 53,657
Total other investments, at fair value 519 506
Trading securities sold, not yet purchased 22,673 24,355
Fair Value, Recurring [Member] | Corporate Bonds and Redeemable Preferred Stock [Member] | Fair Value, Inputs, Level 1 [Member]    
Investments-trading 0 0
Total other investments, at fair value 0 0
Trading securities sold, not yet purchased 0 0
Fair Value, Recurring [Member] | Corporate Bonds and Redeemable Preferred Stock [Member] | Fair Value, Inputs, Level 2 [Member]    
Investments-trading 48,197 53,657
Total other investments, at fair value 519 506
Trading securities sold, not yet purchased 22,673 24,355
Fair Value, Recurring [Member] | Corporate Bonds and Redeemable Preferred Stock [Member] | Fair Value, Inputs, Level 3 [Member]    
Investments-trading 0 0
Total other investments, at fair value 0 0
Trading securities sold, not yet purchased 0 0
Fair Value, Recurring [Member] | Derivative [Member]    
Investments-trading 1,438 7,470
Trading securities sold, not yet purchased 438 6,719
Fair Value, Recurring [Member] | Derivative [Member] | Fair Value, Inputs, Level 1 [Member]    
Investments-trading 0 0
Trading securities sold, not yet purchased 0 0
Fair Value, Recurring [Member] | Derivative [Member] | Fair Value, Inputs, Level 2 [Member]    
Investments-trading 1,438 7,470
Trading securities sold, not yet purchased 438 6,719
Fair Value, Recurring [Member] | Derivative [Member] | Fair Value, Inputs, Level 3 [Member]    
Investments-trading 0 0
Trading securities sold, not yet purchased 0 0
Fair Value, Recurring [Member] | Equity Securities [Member]    
Investments-trading 930 928
Total other investments, at fair value 8,372 38,038
Trading securities sold, not yet purchased 67 393
Other investments, sold not yet purchased 580 97
Fair Value, Recurring [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Investments-trading 930 639
Total other investments, at fair value 8,372 38,038
Trading securities sold, not yet purchased 67 393
Other investments, sold not yet purchased 130 97
Fair Value, Recurring [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Investments-trading 0 289
Total other investments, at fair value 0 0
Trading securities sold, not yet purchased 0 0
Other investments, sold not yet purchased 450 0
Fair Value, Recurring [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Investments-trading 0 0
Total other investments, at fair value 0 0
Trading securities sold, not yet purchased 0 0
Other investments, sold not yet purchased 0 0
Fair Value, Recurring [Member] | Municipal Bonds [Member]    
Investments-trading 17,169 20,572
Fair Value, Recurring [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]    
Investments-trading 0 0
Fair Value, Recurring [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]    
Investments-trading 17,169 20,572
Fair Value, Recurring [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 3 [Member]    
Investments-trading 0 0
Fair Value, Recurring [Member] | Equity Derivatives [Member]    
Total other investments, at fair value 876 1,447
Fair Value, Recurring [Member] | Equity Derivatives [Member] | Fair Value, Inputs, Level 1 [Member]    
Total other investments, at fair value 0 0
Fair Value, Recurring [Member] | Equity Derivatives [Member] | Fair Value, Inputs, Level 2 [Member]    
Total other investments, at fair value 876 1,447
Fair Value, Recurring [Member] | Equity Derivatives [Member] | Fair Value, Inputs, Level 3 [Member]    
Total other investments, at fair value 0 0
Fair Value, Recurring [Member] | Restricted Equity Securities [Member]    
Total other investments, at fair value 10,893 2,054
Fair Value, Recurring [Member] | Restricted Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Total other investments, at fair value 8,574 0
Fair Value, Recurring [Member] | Restricted Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Total other investments, at fair value 2,319 2,054
Fair Value, Recurring [Member] | Restricted Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Total other investments, at fair value 0 0
Fair Value, Recurring [Member] | Fair Value Receivables [Member]    
Total other investments, at fair value 8,821 9,541
Fair Value, Recurring [Member] | Fair Value Receivables [Member] | Fair Value, Inputs, Level 1 [Member]    
Total other investments, at fair value 0 0
Fair Value, Recurring [Member] | Fair Value Receivables [Member] | Fair Value, Inputs, Level 2 [Member]    
Total other investments, at fair value 8,821 9,541
Fair Value, Recurring [Member] | Fair Value Receivables [Member] | Fair Value, Inputs, Level 3 [Member]    
Total other investments, at fair value 0 0
Fair Value, Recurring [Member] | Interest In SPVs [Member]    
Total other investments, at fair value 2,629 12,609
Fair Value, Recurring [Member] | Interest In SPVs [Member] | Fair Value, Inputs, Level 1 [Member]    
Total other investments, at fair value 0 0
Fair Value, Recurring [Member] | Interest In SPVs [Member] | Fair Value, Inputs, Level 2 [Member]    
Total other investments, at fair value 2,629 12,609
Fair Value, Recurring [Member] | Interest In SPVs [Member] | Fair Value, Inputs, Level 3 [Member]    
Total other investments, at fair value 0 0
Fair Value, Recurring [Member] | Share Forward Liabilities [Member]    
Other investments, sold not yet purchased 7,010 24,645
Fair Value, Recurring [Member] | Share Forward Liabilities [Member] | Fair Value, Inputs, Level 1 [Member]    
Other investments, sold not yet purchased 0 0
Fair Value, Recurring [Member] | Share Forward Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]    
Other investments, sold not yet purchased 7,010 24,645
Fair Value, Recurring [Member] | Share Forward Liabilities [Member] | Fair Value, Inputs, Level 3 [Member]    
Other investments, sold not yet purchased $ 0 $ 0
[1] As a practical expedient, the Company uses NAV (or its equivalent) to measure the fair value of its investments in the U.S. Insurance JV and the CREO JV. The U.S. Insurance JV invests in U.S. Dollar ("USD") denominated debt issued by small insurance and reinsurance companies. The CREO JV invests in primarily multi-family commercial real estate mortgage-backed loans. According to ASC 820, these investments are not categorized within the valuation hierarchy.
[2] As a practical expedient, the Company uses NAV (or its equivalent) to measure the fair value of its investments in the U.S. Insurance JV and the CREO JV. The U.S. Insurance JV invests in USD denominated debt issued by small insurance and reinsurance companies. The CREO JV invests in primarily multi-family commercial real estate mortgage-backed loans. According to ASC 820, these investments are not categorized within the valuation hierarchy.