Note 6 - Investments, Available for Sale ("AFS") - Schedule of Available for Sale Securities in Unrealized Loss Position (Details) $ in Thousands	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Fair value, less than 12 months, AFS	$ 78,314	$ 30,319
Accumulated loss, less than 12 months, AFS	$ (551)	$ (316)
Positions, less than 12 months, AFS	52	42
Fair value, 12 months or more, AFS	$ 371,900	$ 376,923
Accumulated loss, 12 months or more, AFS	$ (36,634)	$ (41,890)
Positions, 12 months or more, AFS	320	327
Fair value, unrealized loss position, AFS	$ 450,214	$ 407,242
Accumulated loss, total, AFS	(37,185)	(42,206)
Accumulated loss, less than 12 months, AFS	551	316
Collateralized Loan Obligations [Member]
Fair value, less than 12 months, AFS	10,782	3,014
Accumulated loss, less than 12 months, AFS	$ (111)	$ (10)
Positions, less than 12 months, AFS	11	4
Fair value, 12 months or more, AFS	$ 20,220	$ 23,427
Accumulated loss, 12 months or more, AFS	$ (175)	$ (193)
Positions, 12 months or more, AFS	19	22
Fair value, unrealized loss position, AFS	$ 31,002	$ 26,441
Accumulated loss, total, AFS	(286)	(203)
Accumulated loss, less than 12 months, AFS	111	10
Small Business Administration Bonds [Member]
Fair value, less than 12 months, AFS	12,429	10,795
Accumulated loss, less than 12 months, AFS	$ (135)	$ (154)
Positions, less than 12 months, AFS	14	12
Fair value, 12 months or more, AFS	$ 22,694	$ 24,319
Accumulated loss, 12 months or more, AFS	$ (2,000)	$ (2,248)
Positions, 12 months or more, AFS	42	46
Fair value, unrealized loss position, AFS	$ 35,123	$ 35,114
Accumulated loss, total, AFS	(2,135)	(2,402)
Accumulated loss, less than 12 months, AFS	135	154
Tax Exempt 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	$ 5,850	$ 6,058
Accumulated loss, 12 months or more, AFS	$ (869)	$ (688)
Positions, 12 months or more, AFS	5	5
Fair value, unrealized loss position, AFS	$ 5,850	$ 6,058
Accumulated loss, total, AFS	(869)	(688)
Accumulated loss, less than 12 months, AFS	0	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	$ 54,048	$ 52,560
Accumulated loss, 12 months or more, AFS	$ (10,461)	$ (11,970)
Positions, 12 months or more, AFS	59	59
Fair value, unrealized loss position, AFS	$ 54,048	$ 52,560
Accumulated loss, total, AFS	(10,461)	(11,970)
Accumulated loss, less than 12 months, AFS	0	0
Collateralized Mortgage-Backed Securities [Member]
Fair value, less than 12 months, AFS	55,103	16,510
Accumulated loss, less than 12 months, AFS	$ (305)	$ (152)
Positions, less than 12 months, AFS	27	26
Fair value, 12 months or more, AFS	$ 269,088	$ 270,559
Accumulated loss, 12 months or more, AFS	$ (23,129)	$ (26,791)
Positions, 12 months or more, AFS	195	195
Fair value, unrealized loss position, AFS	$ 324,191	$ 287,069
Accumulated loss, total, AFS	(23,434)	(26,943)
Accumulated loss, less than 12 months, AFS	$ 305	$ 152