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Note 12 - Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Available-for-sale debt securities $ 131,314 $ 169,849 [1]
Derivative assets 51 116
Fair Value, Recurring [Member]    
Available-for-sale debt securities 131,314 169,849
Equity securities 55 55
Fair value loans 2,707 2,993
Derivative assets 51 116
Deferred compensation assets 10,608 8,571
Deferred compensation liabilities 12,140 10,189
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Available-for-sale debt securities 0 0
Equity securities 0 0
Fair value loans 0 0
Derivative assets 0 0
Deferred compensation assets 10,608 8,571
Deferred compensation liabilities 12,140 10,189
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Available-for-sale debt securities 131,314 169,849
Equity securities 55 55
Fair value loans 0 0
Derivative assets 51 116
Deferred compensation assets 0 0
Deferred compensation liabilities 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Available-for-sale debt securities 0 0
Equity securities 0 0
Fair value loans 2,707 2,993
Derivative assets 0 0
Deferred compensation assets 0 0
Deferred compensation liabilities 0 0
Fair Value, Recurring [Member] | US Treasury Securities [Member]    
Available-for-sale debt securities 10,920 55,769
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Available-for-sale debt securities 0 0
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Available-for-sale debt securities 10,920 55,769
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Available-for-sale debt securities 0 0
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]    
Available-for-sale debt securities 10,329 13,837
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Available-for-sale debt securities 0 0
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Available-for-sale debt securities 10,329 13,837
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Available-for-sale debt securities 0 0
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]    
Available-for-sale debt securities 24,423 27,542
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Available-for-sale debt securities 0 0
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Available-for-sale debt securities 24,423 27,542
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Available-for-sale debt securities 0 0
Fair Value, Recurring [Member] | Mortgage-backed Agency Securities [Member]    
Available-for-sale debt securities 85,642 72,701
Fair Value, Recurring [Member] | Mortgage-backed Agency Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Available-for-sale debt securities 0 0
Fair Value, Recurring [Member] | Mortgage-backed Agency Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Available-for-sale debt securities 85,642 72,701
Fair Value, Recurring [Member] | Mortgage-backed Agency Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Available-for-sale debt securities $ 0 $ 0
[1] Derived from audited financial statements