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Note 4 - Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Available for sale securities $ 650,660 $ 648,513
US Treasury Securities [Member]    
Available for sale securities 152,869 167,715
US Government Agencies Debt Securities [Member]    
Available for sale securities 89,933 83,433
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Available for sale securities 110,482 91,050
US States and Political Subdivisions Debt Securities [Member]    
Available for sale securities 236,285 245,562
Corporate Debt Securities [Member]    
Available for sale securities 61,091 60,753
Fair Value, Recurring [Member]    
Loans receivable 7,950 7,923
Derivative financial instruments 815 996
Derivative financial instruments, liabilities 409 248
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Loans receivable 0 0
Derivative financial instruments 0 0
Derivative financial instruments, liabilities 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Loans receivable 7,950 7,923
Derivative financial instruments 815 996
Derivative financial instruments, liabilities 409 248
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Loans receivable 0 0
Derivative financial instruments 0 0
Derivative financial instruments, liabilities 0 0
Fair Value, Recurring [Member] | US Treasury Securities [Member]    
Available for sale securities 152,869 167,715
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Available for sale securities 152,869 167,715
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Available for sale securities 0 0
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Available for sale securities 0 0
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]    
Available for sale securities 89,933 83,433
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Available for sale securities 0 0
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Available for sale securities 89,933 83,433
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Available for sale securities 0 0
Fair Value, Recurring [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Available for sale securities 110,482 91,050
Fair Value, Recurring [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] | Fair Value, Inputs, Level 1 [Member]    
Available for sale securities 0 0
Fair Value, Recurring [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] | Fair Value, Inputs, Level 2 [Member]    
Available for sale securities 110,482 91,050
Fair Value, Recurring [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] | Fair Value, Inputs, Level 3 [Member]    
Available for sale securities 0 0
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
Available for sale securities 236,285 245,562
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Available for sale securities 0 0
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Available for sale securities 236,285 245,562
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Available for sale securities 0 0
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]    
Available for sale securities 61,091 60,753
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Available for sale securities 0 0
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Available for sale securities 61,091 60,753
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Available for sale securities $ 0 $ 0