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Note 3 - Securities - Securities With Unrealized Losses (Details) $ in Thousands	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Count, less than 12 months	8	2
Fair value, less than 12 months	$ 69,871	$ 8,987
Unrealized loss, less than 12 months	$ (129)	$ (13)
Count, 12 months or more	97	198
Fair value, 12 months or more	$ 65,166	$ 134,306
Unrealized loss, 12 months or more	$ (1,129)	$ (3,580)
Count, total	105	200
Fair value, total	$ 135,037	$ 143,293
Unrealized loss, total	$ (1,258)	$ (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	$ 224	$ 217
Unrealized loss, 12 months or more	$ (1)	$ (8)
Count, total	1	1
Fair value, total	$ 224	$ 217
Unrealized loss, total	$ (1)	$ (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	84	170
Fair value, 12 months or more	$ 62,656	$ 112,508
Unrealized loss, 12 months or more	$ (1,065)	$ (3,412)
Count, total	84	170
Fair value, total	$ 62,656	$ 112,508
Unrealized loss, total	$ (1,065)	$ (3,412)
US Government-sponsored Enterprises Debt Securities [Member]
Count, less than 12 months	8	2
Fair value, less than 12 months	$ 69,871	$ 8,987
Unrealized loss, less than 12 months	$ (129)	$ (13)
Count, 12 months or more	0	4
Fair value, 12 months or more	$ 0	$ 17,951
Unrealized loss, 12 months or more	$ 0	$ (49)
Count, total	8	6
Fair value, total	$ 69,871	$ 26,938
Unrealized loss, total	$ (129)	$ (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	7	17
Fair value, 12 months or more	$ 1,398	$ 2,627
Unrealized loss, 12 months or more	$ (52)	$ (91)
Count, total	7	17
Fair value, total	$ 1,398	$ 2,627
Unrealized loss, total	$ (52)	$ (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	$ 888	$ 1,003
Unrealized loss, 12 months or more	$ (11)	$ (20)
Count, total	5	6
Fair value, total	$ 888	$ 1,003
Unrealized loss, total	$ (11)	$ (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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