Note 12 - Fair Value Measurements - Financial Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Securities available for sale	$ 586,407	$ 608,062	[1]
US Treasury Securities [Member]
Securities available for sale	141,552	139,427
US Government-sponsored Enterprises Debt Securities [Member]
Securities available for sale	84,273	83,348
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale	46,909	63,723
Corporate Debt Securities [Member]
Securities available for sale	27,442	27,471
Fair Value, Recurring [Member]
Securities available for sale	586,407	608,062
Loans held for sale	650	1,061
Fair Value, Recurring [Member] | Cash Flow Hedging [Member]
Derivatives - cash flow hedges	770	1,325
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale	0	0
Loans held for sale	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Cash Flow Hedging [Member]
Derivatives - cash flow hedges	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale	586,407	608,062
Loans held for sale	650	1,061
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cash Flow Hedging [Member]
Derivatives - cash flow hedges	770	1,325
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale	0	0
Loans held for sale	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Cash Flow Hedging [Member]
Derivatives - cash flow hedges	0	0
Fair Value, Recurring [Member] | US Treasury Securities [Member]
Securities available for sale	141,552	139,427
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale	0	0
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale	141,552	139,427
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale	0	0
Fair Value, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Securities available for sale	84,273	83,348
Fair Value, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale	0	0
Fair Value, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale	84,273	83,348
Fair Value, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale	0	0
Fair Value, Recurring [Member] | Collateralized Mortgage Obligations [Member]
Securities available for sale	286,231	294,093
Fair Value, Recurring [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale	0	0
Fair Value, Recurring [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale	286,231	294,093
Fair Value, Recurring [Member] | Collateralized Mortgage Obligations [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale	0	0
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Securities available for sale	46,909	63,723
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale	0	0
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale	46,909	63,723
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale	0	0
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Securities available for sale	27,442	27,471
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale	0	0
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale	27,442	27,471
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale	$ 0	$ 0

[1] Derived from audited consolidated financial statements