Note 6 - Investments, Available for Sale ("AFS") - Schedule of Available for Sale Securities in Unrealized Loss Position (Details) $ in Thousands	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Fair value, less than 12 months, AFS	$ 33,208	$ 38,646
Accumulated loss, less than 12 months, AFS	$ (183)	$ (440)
Positions, less than 12 months, AFS	33	35
Fair value, 12 months or more, AFS	$ 427,447	$ 441,967
Accumulated loss, 12 months or more, AFS	$ (46,260)	$ (47,369)
Positions, 12 months or more, AFS	375	381
Fair value, unrealized loss position, AFS	$ 460,655	$ 480,613
Accumulated loss, total, AFS	(46,443)	(47,809)
Accumulated loss, less than 12 months, AFS	$ 183	$ 440
Positions, less than 12 months, AFS	(33)	(35)
Collateralized Loan Obligations [Member]
Fair value, less than 12 months, AFS	$ 348	$ 377
Accumulated loss, less than 12 months, AFS	$ 0	$ (1)
Positions, less than 12 months, AFS	1	1
Fair value, 12 months or more, AFS	$ 38,658	$ 43,872
Accumulated loss, 12 months or more, AFS	$ (406)	$ (727)
Positions, 12 months or more, AFS	32	34
Fair value, unrealized loss position, AFS	$ 39,006	$ 44,249
Accumulated loss, total, AFS	(406)	(728)
Accumulated loss, less than 12 months, AFS	$ (0)	$ 1
Positions, less than 12 months, AFS	(1)	(1)
Small Business Administration Bonds [Member]
Fair value, less than 12 months, AFS	$ 2,208	$ 2,200
Accumulated loss, less than 12 months, AFS	$ (6)	$ (5)
Positions, less than 12 months, AFS	5	4
Fair value, 12 months or more, AFS	$ 36,193	$ 39,151
Accumulated loss, 12 months or more, AFS	$ (2,703)	$ (2,672)
Positions, 12 months or more, AFS	57	63
Fair value, unrealized loss position, AFS	$ 38,401	$ 41,351
Accumulated loss, total, AFS	(2,709)	(2,677)
Accumulated loss, less than 12 months, AFS	$ 6	$ 5
Positions, less than 12 months, AFS	(5)	(4)
Tax Exempt Municipal Bonds [Member]
Fair value, less than 12 months, AFS	$ 549	$ 0
Accumulated loss, less than 12 months, AFS	$ (1)	$ 0
Positions, less than 12 months, AFS	1	0
Fair value, 12 months or more, AFS	$ 12,827	$ 12,965
Accumulated loss, 12 months or more, AFS	$ (992)	$ (908)
Positions, 12 months or more, AFS	12	12
Fair value, unrealized loss position, AFS	$ 13,376	$ 12,965
Accumulated loss, total, AFS	(993)	(908)
Accumulated loss, less than 12 months, AFS	$ 1	$ (0)
Positions, less than 12 months, AFS	(1)	0
Taxable Municipal Bonds [Member]
Fair value, less than 12 months, AFS	$ 0	$ 0
Accumulated loss, less than 12 months, AFS	$ 0	$ 0
Positions, less than 12 months, AFS	(0)	0
Fair value, 12 months or more, AFS	$ 52,752	$ 53,115
Accumulated loss, 12 months or more, AFS	$ (11,897)	$ (11,554)
Positions, 12 months or more, AFS	59	59
Fair value, unrealized loss position, AFS	$ 52,752	$ 53,115
Accumulated loss, total, AFS	(11,897)	(11,554)
Accumulated loss, less than 12 months, AFS	$ 0	$ (0)
Positions, less than 12 months, AFS	0	0
Collateralized Mortgage-Backed Securities [Member]
Fair value, less than 12 months, AFS	$ 30,103	$ 36,069
Accumulated loss, less than 12 months, AFS	$ (176)	$ (434)
Positions, less than 12 months, AFS	26	30
Fair value, 12 months or more, AFS	$ 287,017	$ 292,864
Accumulated loss, 12 months or more, AFS	$ (30,262)	$ (31,508)
Positions, 12 months or more, AFS	215	213
Fair value, unrealized loss position, AFS	$ 317,120	$ 328,933
Accumulated loss, total, AFS	(30,438)	(31,942)
Accumulated loss, less than 12 months, AFS	$ 176	$ 434
Positions, less than 12 months, AFS	(26)	(30)