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Note 3 - Investments - Schedule of Amortized Costs and Fair Values of Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Amortized cost, available for sale securities	$ 309,959	$ 328,695
Gross unrealized gains, available for sale securities	325	939
Gross unrealized losses, available for sale securities	(30,641)	(36,701)
Fair value, available for sale securities	279,643	292,933
Available-for-Sale, Allowance for Credit Loss	0	0
Amortized cost, held to maturity securities	8,500	8,500
Gross unrealized gains, held to maturity securities	0	0
Gross unrealized losses, held to maturity securities	(715)	(834)
Securities held-to-maturity, at fair value	7,785	7,666
Securities available for sale, HTM, ACL	45	45	$ 31	$ 31
Amortized cost	318,459	337,195
Gross unrealized gains	325	939
Gross unrealized losses	(31,356)	(37,535)
Total securities, fair value	287,428	300,599
Total securities, allowance for credit loss	45	45
US Government Agencies Debt Securities [Member]
Amortized cost, available for sale securities	21,151	21,151
Gross unrealized gains, available for sale securities	45	46
Gross unrealized losses, available for sale securities	(3,298)	(3,179)
Fair value, available for sale securities	17,898	18,018
Available-for-Sale, Allowance for Credit Loss	0	0
Corporate Debt Securities [Member]
Amortized cost, available for sale securities	16,000	13,000
Gross unrealized gains, available for sale securities	90	613
Gross unrealized losses, available for sale securities	(890)	(741)
Fair value, available for sale securities	15,200	12,872
Available-for-Sale, Allowance for Credit Loss	0	0
Amortized cost, held to maturity securities	8,500	8,500
Gross unrealized gains, held to maturity securities	0	0
Gross unrealized losses, held to maturity securities	(715)	(834)
Securities held-to-maturity, at fair value	7,785	7,666
Securities available for sale, HTM, ACL	45	45
Municipal Bonds [Member]
Amortized cost, available for sale securities	86,257	138,803
Gross unrealized gains, available for sale securities	18	42
Gross unrealized losses, available for sale securities	(12,722)	(19,398)
Fair value, available for sale securities	73,553	119,447
Available-for-Sale, Allowance for Credit Loss	0	0
Collateralized Mortgage-Backed Securities [Member]
Amortized cost, available for sale securities	131,594	112,855
Gross unrealized gains, available for sale securities	172	238
Gross unrealized losses, available for sale securities	(11,964)	(11,845)
Fair value, available for sale securities	119,802	101,248
Available-for-Sale, Allowance for Credit Loss	0	0
U.S. Small Business Administration Securities [Member]
Amortized cost, available for sale securities	54,957	42,886
Gross unrealized gains, available for sale securities	0	0
Gross unrealized losses, available for sale securities	(1,767)	(1,538)
Fair value, available for sale securities	53,190	41,348
Available-for-Sale, Allowance for Credit Loss	$ 0	$ 0

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