Note 6 - Investment Securities (Details Textual)	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($) Security shares	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) Security shares	Jun. 30, 2023 USD ($)	Aug. 07, 2024 USD ($) shares	Dec. 31, 2023 USD ($) shares
Investment Securities [Line Items]
Proceeds from sale of investment securities	$ 13,139,000	$ 0	$ 13,139,000	$ 9,081,000
Available-for-sale securities pledged as collateral	$ 255,369,000		$ 255,369,000			$ 289,935,000
Debt Securities, Available-for-Sale, Restriction Type [Extensible Enumeration]	us-gaap:AssetPledgedAsCollateralMember		us-gaap:AssetPledgedAsCollateralMember			us-gaap:AssetPledgedAsCollateralMember
Other than temporary impairment, credit losses recognized in earnings	$ 0	0	$ 0	0
Available-for-sale, amortized cost	542,491,000		542,491,000			$ 576,178,000
Available-for-sale	460,418,000		460,418,000			490,182,000
Investment equity securities	$ 7,233,000		7,233,000			$ 5,910,000
Proceeds from sale of investment equity securities			$ 1,210,000	7,138,000
Common stock shares | shares	3,886,653		3,886,653			3,861,940
Unrealized gain (loss) on equity securities	$ 1,016,000	(573,000)	$ 986,000	(516,000)
Securities for reverse of makewhole agreement	$ 85,000		$ 85,000
Pooled Trust Preferred Security [Member]
Investment Securities [Line Items]
Number of trust preferred securities | Security	1		1
Available-for-sale, amortized cost	$ 58,000		$ 58,000
Available-for-sale	52,000		52,000
Equity Securities [Member]
Investment Securities [Line Items]
Income tax expense (benefit) related to net recognized gains (losses) on sales of securities	191,000	(15,000)	287,000	(58,000)
Debt Securities [Member]
Investment Securities [Line Items]
Income tax expense (benefit) related to net realized gains (losses) on sales of securities	(230,000)	$ 0	$ (230,000)	$ (54,000)
Common Class C [Member]
Investment Securities [Line Items]
Unrealized gain (loss) on equity securities	$ 1,354,000
Subsequent Event [Member]
Investment Securities [Line Items]
Common stock , carrying basis					$ 0
Subsequent Event [Member] | Common Class B-1 [Member]
Investment Securities [Line Items]
Common stock shares | shares					6,502
Subsequent Event [Member] | Common Class B-2 [Member]
Investment Securities [Line Items]
Common stock shares | shares					3,251
Subsequent Event [Member] | Common Class C [Member]
Investment Securities [Line Items]
Common stock shares | shares					1,290