Note 3 - Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt securities available for sale (at fair value)	$ 490,271	$ 502,762	[1]
Equity investments (at fair value)	11,571	10,958	[1]
Fair Value, Recurring [Member]
Debt securities available for sale (at fair value)	490,271	502,762
Equity investments (at fair value)	11,571	10,958
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Debt securities available for sale (at fair value)	0	0
Equity investments (at fair value)	7,107	6,557
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Debt securities available for sale (at fair value)	485,804	498,155
Equity investments (at fair value)	4,464	4,401
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Debt securities available for sale (at fair value)	4,467	4,607
Equity investments (at fair value)	0	0
US Government Corporations and Agencies Securities [Member]
Debt securities available for sale (at fair value)	21,503	22,825
US Government Corporations and Agencies Securities [Member] | Fair Value, Recurring [Member]
Debt securities available for sale (at fair value)	21,503	22,825
US Government Corporations and Agencies Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Debt securities available for sale (at fair value)	0	0
US Government Corporations and Agencies Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Debt securities available for sale (at fair value)	21,503	22,825
US Government Corporations and Agencies Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Debt securities available for sale (at fair value)	0	0
Government Sponsored Agencies [Member]
Debt securities available for sale (at fair value)	123,119	129,567
Government Sponsored Agencies [Member] | Fair Value, Recurring [Member]
Debt securities available for sale (at fair value)	123,119	129,567
Government Sponsored Agencies [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Debt securities available for sale (at fair value)	0	0
Government Sponsored Agencies [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Debt securities available for sale (at fair value)	123,119	129,567
Government Sponsored Agencies [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Debt securities available for sale (at fair value)	0	0
Nongovernment Sponsored Agencies [Member]
Debt securities available for sale (at fair value)	73,856	73,869
Nongovernment Sponsored Agencies [Member] | Fair Value, Recurring [Member]
Debt securities available for sale (at fair value)	73,856	73,869
Nongovernment Sponsored Agencies [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Debt securities available for sale (at fair value)	0	0
Nongovernment Sponsored Agencies [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Debt securities available for sale (at fair value)	69,389	69,262
Nongovernment Sponsored Agencies [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Debt securities available for sale (at fair value)	4,467	4,607
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member]
Debt securities available for sale (at fair value)	95,992	94,929
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Debt securities available for sale (at fair value)	0	0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Debt securities available for sale (at fair value)	95,992	94,929
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Debt securities available for sale (at fair value)	0	0
Corporate Debt Securities [Member]
Debt securities available for sale (at fair value)	36,589	37,907
Corporate Debt Securities [Member] | Fair Value, Recurring [Member]
Debt securities available for sale (at fair value)	36,589	37,907
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Debt securities available for sale (at fair value)	0	0
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Debt securities available for sale (at fair value)	36,589	37,907
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Debt securities available for sale (at fair value)	0	0
Asset-Backed Securities [Member]
Debt securities available for sale (at fair value)	41,350	44,205
Asset-Backed Securities [Member] | Fair Value, Recurring [Member]
Debt securities available for sale (at fair value)	41,350	44,205
Asset-Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Debt securities available for sale (at fair value)	0	0
Asset-Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Debt securities available for sale (at fair value)	41,350	44,205
Asset-Backed Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Debt securities available for sale (at fair value)	0	0
Tax Exempt Debt Securities U.S. States And Political Subdivisions [Member] | Fair Value, Recurring [Member]
Debt securities available for sale (at fair value)	97,862	99,460
Tax Exempt Debt Securities U.S. States And Political Subdivisions [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Debt securities available for sale (at fair value)	0	0
Tax Exempt Debt Securities U.S. States And Political Subdivisions [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Debt securities available for sale (at fair value)	97,862	99,460
Tax Exempt Debt Securities U.S. States And Political Subdivisions [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Debt securities available for sale (at fair value)	0	0
Interest Rate Cap [Member] | Fair Value, Recurring [Member]
Derivative financial assets	25,321	24,314
Interest Rate Cap [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative financial assets	0	0
Interest Rate Cap [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative financial assets	25,321	24,314
Interest Rate Cap [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Derivative financial assets	0	0
Interest Rate Swap [Member] | Fair Value, Recurring [Member]
Derivative financial assets	11,482	8,831
Interest Rate Swap [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative financial assets	0	0
Interest Rate Swap [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative financial assets	11,482	8,831
Interest Rate Swap [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Derivative financial assets	$ 0	$ 0

[1] Derived from audited consolidated financial statements.