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Note 3 - Securities - Securities With Unrealized Losses (Details) $ in Thousands	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Count, less than 12 months	10	2
Fair value, less than 12 months	$ 84,816	$ 8,987
Unrealized loss, less than 12 months	$ (179)	$ (13)
Count, 12 months or more	155	198
Fair value, 12 months or more	$ 109,309	$ 134,306
Unrealized loss, 12 months or more	$ (2,957)	$ (3,580)
Count, total	165	200
Fair value, total	$ 194,125	$ 143,293
Unrealized loss, total	$ (3,136)	$ (3,593)
US States and Political Subdivisions Debt Securities [Member]
Count, less than 12 months	0	0
Fair value, less than 12 months	$ 0	$ 0
Unrealized loss, less than 12 months	$ 0	$ 0
Count, 12 months or more	1	1
Fair value, 12 months or more	$ 219	$ 217
Unrealized loss, 12 months or more	$ (6)	$ (8)
Count, total	1	1
Fair value, total	$ 219	$ 217
Unrealized loss, total	$ (6)	$ (8)
US Treasury Securities [Member]
Count, less than 12 months	0	0
Fair value, less than 12 months	$ 0	$ 0
Unrealized loss, less than 12 months	$ 0	$ 0
Count, 12 months or more	132	170
Fair value, 12 months or more	$ 92,709	$ 112,508
Unrealized loss, 12 months or more	$ (2,815)	$ (3,412)
Count, total	132	170
Fair value, total	$ 92,709	$ 112,508
Unrealized loss, total	$ (2,815)	$ (3,412)
US Government-sponsored Enterprises Debt Securities [Member]
Count, less than 12 months	10	2
Fair value, less than 12 months	$ 84,816	$ 8,987
Unrealized loss, less than 12 months	$ (179)	$ (13)
Count, 12 months or more	3	4
Fair value, 12 months or more	$ 12,984	$ 17,951
Unrealized loss, 12 months or more	$ (16)	$ (49)
Count, total	13	6
Fair value, total	$ 97,800	$ 26,938
Unrealized loss, total	$ (195)	$ (62)
Residential Mortgage-Backed Securities [Member]
Count, less than 12 months	0	0
Fair value, less than 12 months	$ 0	$ 0
Unrealized loss, less than 12 months	$ 0	$ 0
Count, 12 months or more	14	17
Fair value, 12 months or more	$ 2,425	$ 2,627
Unrealized loss, 12 months or more	$ (102)	$ (91)
Count, total	14	17
Fair value, total	$ 2,425	$ 2,627
Unrealized loss, total	$ (102)	$ (91)
Collateralized Mortgage-Backed Securities [Member]
Count, less than 12 months	0	0
Fair value, less than 12 months	$ 0	$ 0
Unrealized loss, less than 12 months	$ 0	$ 0
Count, 12 months or more	5	6
Fair value, 12 months or more	$ 972	$ 1,003
Unrealized loss, 12 months or more	$ (18)	$ (20)
Count, total	5	6
Fair value, total	$ 972	$ 1,003
Unrealized loss, total	$ (18)	$ (20)

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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