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Note 2 - INVESTMENT SECURITIES (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
state
security
issuer
Mar. 31, 2023
USD ($)
Jun. 30, 2024
USD ($)
state
item
security
issuer
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
issuer
state
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]          
Number of securities | security 647   647    
Aggregate losses of securities (as a percent) 9.50%   9.50%    
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions | security 553   553    
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | security 464   464    
Securities trading, at fair value $ 22,362   $ 22,362   $ 22,369
Recognized trading gain (loss) $ 234   $ 253    
Number Of Charters Owning Municipal Securities | item     4    
General Obligation Bonds          
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]          
Number of issuers | issuer 79   79   82
Other investments $ 94,200   $ 94,200   $ 99,400
Number of states holding investments | state 18   18   18
General Obligation Bonds | Aggregate Fair Value Exceeding 5 Million          
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]          
Number of states holding investments | state 8   8   8
General Obligation Bonds | Aggregate Fair Value Exceeding 5 Million | Minimum          
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]          
Other investments $ 5,000   $ 5,000   $ 5,000
Revenue Bonds          
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]          
Number of issuers | issuer 163   163   169
Other investments $ 766,500   $ 766,500   $ 750,800
Number of states holding investments | state 31   31   31
Revenue Bonds | Aggregate Fair Value Exceeding 5 Million          
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]          
Number of states holding investments | state 14   14   15
Revenue Bonds | Aggregate Fair Value Exceeding 5 Million | Minimum          
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]          
Other investments $ 5,000   $ 5,000   $ 5,000
Revenue Bonds | Aggregate Book Or Market Value Exceeded 5% of The Company Equity          
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]          
Number of issuers | issuer 2   2   2
Percentage threshold 5.00%   5.00%    
Other securities          
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]          
Provision for credit loss expense       $ 989  
Corporate securities          
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]          
Provision for credit loss expense   $ 989 $ (445)