Note 5 - Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Available for sale securities	$ 723,205	$ 736,389
US Treasury Securities [Member]
Available for sale securities	200,328	200,088
US Government Agencies Debt Securities [Member]
Available for sale securities	92,265	92,615
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Available for sale securities	98,159	101,864
US States and Political Subdivisions Debt Securities [Member]
Available for sale securities	262,855	269,891
Corporate Debt Securities [Member]
Available for sale securities	69,598	71,931
Fair Value, Recurring [Member]
Loans	8,096	8,327
Derivative financial instruments		1,225
Derivative financial instruments, liabilities		745
Fair Value, Recurring [Member] \| Other Assets [Member]
Derivative financial instruments	1,203
Fair Value, Recurring [Member] \| Other Liabilities [Member]
Derivative financial instruments, liabilities	238
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Loans	0	0
Derivative financial instruments		0
Derivative financial instruments, liabilities		0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Other Assets [Member]
Derivative financial instruments	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Other Liabilities [Member]
Derivative financial instruments, liabilities	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Loans	8,096	8,327
Derivative financial instruments		1,225
Derivative financial instruments, liabilities		745
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Other Assets [Member]
Derivative financial instruments	1,203
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Other Liabilities [Member]
Derivative financial instruments, liabilities	238
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Loans	0	0
Derivative financial instruments		0
Derivative financial instruments, liabilities		0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Other Assets [Member]
Derivative financial instruments	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Other Liabilities [Member]
Derivative financial instruments, liabilities	0
Fair Value, Recurring [Member] \| US Treasury Securities [Member]
Available for sale securities	200,328	200,088
Fair Value, Recurring [Member] \| US Treasury Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Available for sale securities	200,328	200,088
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	92,265	92,615
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	92,265	92,615
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	98,159	101,864
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	98,159	101,864
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	262,855	269,891
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	262,855	269,891
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	69,598	71,931
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	69,598	71,931
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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

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