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Note 3 - Investments - Schedule of Amortized Costs and Fair Values of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Amortized cost, available for sale securities	$ 328,695	$ 271,793
Gross unrealized gains, available for sale securities	939	48
Gross unrealized losses, available for sale securities	(36,701)	(42,589)
Fair value, available for sale securities	292,933	229,252
Securities available for sale, AFS, ACL	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	(834)	(571)
Securities held-to-maturity, at fair value	7,666	7,929
Securities available for sale, HTM, ACL	45	31	$ 0
Amortized cost	337,195	280,293
Gross unrealized gains	939	48
Gross unrealized losses	(37,535)	(43,160)
Total securities, fair value	300,599	237,181
Total securities, allowance for credit loss	45	31
US Government Agencies Debt Securities [Member]
Amortized cost, available for sale securities	21,151	21,153
Gross unrealized gains, available for sale securities	46	0
Gross unrealized losses, available for sale securities	(3,179)	(3,865)
Fair value, available for sale securities	18,018	17,288
Securities available for sale, AFS, ACL	0	0
Corporate Debt Securities [Member]
Amortized cost, available for sale securities	13,000	9,497
Gross unrealized gains, available for sale securities	613	27
Gross unrealized losses, available for sale securities	(741)	(979)
Fair value, available for sale securities	12,872	8,545
Securities available for sale, AFS, ACL	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	(834)	(571)
Securities held-to-maturity, at fair value	7,666	7,929
Securities available for sale, HTM, ACL	45	31
Municipal Bonds [Member]
Amortized cost, available for sale securities	138,803	144,200
Gross unrealized gains, available for sale securities	42	21
Gross unrealized losses, available for sale securities	(19,398)	(23,619)
Fair value, available for sale securities	119,447	120,602
Securities available for sale, AFS, ACL	0	0
Collateralized Mortgage-Backed Securities [Member]
Amortized cost, available for sale securities	112,855	82,424
Gross unrealized gains, available for sale securities	238	0
Gross unrealized losses, available for sale securities	(11,845)	(12,458)
Fair value, available for sale securities	101,248	69,966
Securities available for sale, AFS, ACL	0	0
U.S. Small Business Administration Securities [Member]
Amortized cost, available for sale securities	42,886	14,519
Gross unrealized gains, available for sale securities	0	0
Gross unrealized losses, available for sale securities	(1,538)	(1,668)
Fair value, available for sale securities	41,348	12,851
Securities available for sale, AFS, ACL	$ 0	$ 0

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