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Note 2 - INVESTMENT SECURITIES (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
security
state
issuer
Sep. 30, 2024
USD ($)
security
Mar. 31, 2023
USD ($)
Sep. 30, 2025
USD ($)
security
state
issuer
item
Sep. 30, 2024
USD ($)
security
Dec. 31, 2024
USD ($)
state
issuer
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]            
Number of securities | security 680     680    
Aggregate losses of securities (as a percent) 13.30%     13.30%    
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions | security 518     518    
Available-for-sale, unrealized loss positions, qualitative disclosure, number of positions, greater than or equal to one year | security 451     451    
Securities trading, at fair value $ 83,225     $ 83,225   $ 83,529
Recognized trading net gain (loss)       530 $ 53  
Transfer of debt securities held to maturity       $ 0 $ 0  
Number of security sold | security 0 0   0 1  
Number of charters owning municipal securities | item       4    
Asset Pledged as Collateral [Member]            
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]            
Investment securities pledged $ 365,165     $ 365,165   188,221
Corporate securities            
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]            
Provision for credit loss expense 0 $ 0 $ 989 0 $ (445)  
Municipal securities | Asset Pledged as Collateral [Member]            
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]            
Investment securities pledged $ 326,417     $ 326,417   $ 151,107
General Obligation Bonds            
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]            
Number of issuers | issuer 80     80   79
Other investments $ 106,000     $ 106,000   $ 103,500
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 9     9   9
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 162     162   165
Other investments $ 875,600     $ 875,600   $ 828,000
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   13
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