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Note 9 - Fair Value Disclosures - Fair Value Measurements on a Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Investments-trading $ 211,828 $ 223,865
Total other investments, at fair value 28,022 56,033
Investment securities sold, not yet purchased 133,957 62,512
Other investments, sold not yet purchased 78 2,488
Corporate Bonds and Redeemable Preferred Stock [Member]    
Investments-trading 44,572 45,519
Investment securities sold, not yet purchased 61,310 32,574
Foreign Government Bonds [Member]    
Investments-trading 0 467
Municipal Bonds [Member]    
Investments-trading 19,502 18,841
Certificates of Deposit [Member]    
Investments-trading 0 169
Derivative [Member]    
Investments-trading 4,669 1,275
Investment securities sold, not yet purchased 1,177 424
Equity Securities [Member]    
Investments-trading 220 1,118
Total other investments, at fair value 13,725 27,104
Investment securities sold, not yet purchased 51 0
Other investments, sold not yet purchased 78 2,488
Fair Value, Recurring [Member]    
Investments-trading 211,828 223,865
Total other investments, at fair value 28,022 56,033
Investment securities sold, not yet purchased 133,957 62,512
Other investments, sold not yet purchased 78 2,488
Fair Value, Recurring [Member] | Corporate Bonds and Redeemable Preferred Stock [Member]    
Investments-trading 44,572 45,519
Total other investments, at fair value 476 476
Investment securities sold, not yet purchased 61,310 32,574
Fair Value, Recurring [Member] | Foreign Government Bonds [Member]    
Investments-trading   467
Fair Value, Recurring [Member] | Municipal Bonds [Member]    
Investments-trading 19,502 18,841
Fair Value, Recurring [Member] | Certificates of Deposit [Member]    
Investments-trading   169
Fair Value, Recurring [Member] | Derivative [Member]    
Investments-trading 4,669 1,275
Investment securities sold, not yet purchased 1,177 424
Other investments, sold not yet purchased   2,488
Fair Value, Recurring [Member] | Equity Securities [Member]    
Investments-trading 220 1,118
Total other investments, at fair value 13,725 27,104
Investment securities sold, not yet purchased 51  
Other investments, sold not yet purchased 78  
Fair Value, Recurring [Member] | Restricted Equity Securities [Member]    
Total other investments, at fair value 3,135 17,078
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Investments-trading 12,612 0
Investment securities sold, not yet purchased 71,437 29,514
Other investments, sold not yet purchased 78 2,488
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Bonds and Redeemable Preferred Stock [Member]    
Investments-trading 0 0
Total other investments, at fair value 0 0
Investment securities sold, not yet purchased 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Government Bonds [Member]    
Investments-trading   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Municipal Bonds [Member]    
Investments-trading 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member]    
Investments-trading   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Derivative [Member]    
Investments-trading 0 0
Investment securities sold, not yet purchased 0 0
Other investments, sold not yet purchased   2,488
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]    
Investments-trading 220 0
Total other investments, at fair value 13,725 27,104
Investment securities sold, not yet purchased 51  
Other investments, sold not yet purchased 78  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Restricted Equity Securities [Member]    
Total other investments, at fair value 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Investments-trading 199,216 223,865
Investment securities sold, not yet purchased 62,520 32,998
Other investments, sold not yet purchased 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Bonds and Redeemable Preferred Stock [Member]    
Investments-trading 44,572 45,519
Total other investments, at fair value 476 476
Investment securities sold, not yet purchased 61,310 32,574
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Government Bonds [Member]    
Investments-trading   467
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member]    
Investments-trading 19,502 18,841
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member]    
Investments-trading   169
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Derivative [Member]    
Investments-trading 4,669 1,275
Investment securities sold, not yet purchased 1,177 424
Other investments, sold not yet purchased   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]    
Investments-trading 0 1,118
Total other investments, at fair value 0 0
Investment securities sold, not yet purchased 0  
Other investments, sold not yet purchased 0  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Restricted Equity Securities [Member]    
Total other investments, at fair value 3,135 17,078
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Investments-trading 0 0
Investment 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] | Corporate Bonds and Redeemable Preferred Stock [Member]    
Investments-trading 0 0
Total other investments, at fair value 0 0
Investment securities sold, not yet purchased 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Government Bonds [Member]    
Investments-trading   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Municipal Bonds [Member]    
Investments-trading 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Certificates of Deposit [Member]    
Investments-trading   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Derivative [Member]    
Investments-trading 0 0
Investment securities sold, not yet purchased 0 0
Other investments, sold not yet purchased   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]    
Investments-trading 0 0
Total other investments, at fair value 0 0
Investment securities sold, not yet purchased 0  
Other investments, sold not yet purchased 0  
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Restricted Equity Securities [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 [1] 10,554 11,260
US Treasury Securities [Member]    
Investment securities sold, not yet purchased 71,386 29,513
US Treasury Securities [Member] | Fair Value, Recurring [Member]    
Investments-trading 12,392  
Investment securities sold, not yet purchased 71,386 29,513
US Treasury Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Investments-trading 12,392  
Investment securities sold, not yet purchased 71,386 29,513
US Treasury Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Investments-trading 0  
Investment securities sold, not yet purchased 0 0
US Treasury Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Investments-trading 0  
Investment securities sold, not yet purchased 0 0
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Investment securities sold, not yet purchased 1 1
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member]    
Investments-trading 97,276 134,093
Investment securities sold, not yet purchased 1 1
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Investments-trading 0 0
Investment securities sold, not yet purchased 0 1
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Investments-trading 97,276 134,093
Investment securities sold, not yet purchased 1 0
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Investments-trading 0 0
Investment securities sold, not yet purchased 0 0
US Government Agencies Debt Securities [Member]    
Investment securities sold, not yet purchased 32 0
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member]    
Investments-trading 19,683 22,373
Investment securities sold, not yet purchased 32  
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Investments-trading 0 0
Investment securities sold, not yet purchased 0  
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Investments-trading 19,683 22,373
Investment securities sold, not yet purchased 32  
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Investments-trading 0 0
Investment securities sold, not yet purchased 0  
Residential Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member]    
Investments-trading 7 9
Residential Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Investments-trading 0 0
Residential Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Investments-trading 7 9
Residential Mortgage-Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Investments-trading 0 0
Asset-Backed Securities [Member] | Fair Value, Recurring [Member]    
Investments-trading 1 1
Asset-Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Investments-trading 0 0
Asset-Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Investments-trading 1 1
Asset-Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Investments-trading 0 0
Residential Mortgage Loans [Member] | Fair Value, Recurring [Member]    
Investments-trading 13,506  
Residential Mortgage Loans [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Investments-trading 0  
Residential Mortgage Loans [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Investments-trading 13,506  
Residential Mortgage Loans [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Investments-trading 0  
Residential Mortgage [Member]    
Total other investments, at fair value 132 115
Residential Mortgage [Member] | Fair Value, Recurring [Member]    
Total other investments, at fair value 132 115
Residential Mortgage [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Total other investments, at fair value 0 0
Residential Mortgage [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Total other investments, at fair value 132 115
Residential Mortgage [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Total other investments, at fair value 0 0
Total Investments not Measured at NAV [Member] | Fair Value, Recurring [Member]    
Total other investments, at fair value 17,468 44,773
Total Investments not Measured at NAV [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Total other investments, at fair value 13,725 27,104
Total Investments not Measured at NAV [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Total other investments, at fair value 3,743 17,669
Total Investments not Measured at NAV [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Total other investments, at fair value $ 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, the SPAC Fund and the CREO JV. The U.S. Insurance JV invests in USD denominated debt issued by small insurance and reinsurance companies. The SPAC Fund invests in equity securities of SPACs. The CREO JV invests in primarily multi-family commercial real estate mortgage-backed loans and below-investment grade rated tranches in CRE CLOs collateralized by mostly transitional commercial real estate mortgage-backed loans. See note 4. According to ASC 820, these investments are not categorized within the valuation hierarchy.