Note 16 - Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Available for sale securities	$ 736,389	$ 786,438
US Treasury Securities [Member]
Available for sale securities	200,088	207,597
US Government Agencies Debt Securities [Member]
Available for sale securities	92,615	100,933
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available for sale securities	101,864	116,741
US States and Political Subdivisions Debt Securities [Member]
Available for sale securities	269,891	286,003
Corporate Debt Securities [Member]
Available for sale securities	71,931	75,164
Fair Value, Recurring [Member]
Loans	8,327	8,494
Interest rate swaps, Fair value		1,096
Fair Value, Recurring [Member] \| Other Assets [Member]
Interest rate swaps, Fair value	1,225
Fair Value, Recurring [Member] \| Other Liabilities [Member]
Derivative financial instruments	745
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Loans	0	0
Interest rate swaps, Fair value		0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Other Assets [Member]
Interest rate swaps, Fair value	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Other Liabilities [Member]
Derivative financial instruments	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Loans	8,327	8,494
Interest rate swaps, Fair value		1,096
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Other Assets [Member]
Interest rate swaps, Fair value	1,225
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Other Liabilities [Member]
Derivative financial instruments	745
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Loans	0	0
Interest rate swaps, Fair value		0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Other Assets [Member]
Interest rate swaps, Fair value	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Other Liabilities [Member]
Derivative financial instruments	0
Fair Value, Recurring [Member] \| US Treasury Securities [Member]
Available for sale securities	200,088	207,597
Fair Value, Recurring [Member] \| US Treasury Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Available for sale securities	200,088	207,597
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	92,615	100,933
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	92,615	100,933
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 Securities, Issued by US Government Sponsored Enterprises [Member]
Available for sale securities	101,864	116,741
Fair Value, Recurring [Member] \| Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] \| Fair Value, Inputs, Level 1 [Member]
Available for sale securities	0	0
Fair Value, Recurring [Member] \| Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] \| Fair Value, Inputs, Level 2 [Member]
Available for sale securities	101,864	116,741
Fair Value, Recurring [Member] \| Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [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	269,891	286,003
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	269,891	286,003
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	71,931	75,164
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	71,931	75,164
Fair Value, Recurring [Member] \| Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Available for sale securities	$ 0	$ 0

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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