Note 3 - Securities - Securities With Unrealized Losses (Details) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Count, less than 12 months	2	180
Collateralized mortgage obligations - residential, fair value	$ 8,987	$ 148,388
Unrealized loss, less than 12 months	$ (13)	$ (4,581)
Count, 12 months or more	198	54
Fair value, 12 months or more	$ 134,306	$ 58,835
Unrealized loss, 12 months or more	$ (3,580)	$ (3,707)
Count, total	200	234
Fair value, total	$ 143,293	$ 207,223
Unrealized loss, total	$ (3,593)	$ (8,288)
US States and Political Subdivisions Debt Securities [Member]
Count, less than 12 months	0	1
Collateralized mortgage obligations - residential, fair value	$ 0	$ 225
Unrealized loss, less than 12 months	$ 0	$ (15)
Count, 12 months or more	1	0
Fair value, 12 months or more	$ 217	$ 0
Unrealized loss, 12 months or more	$ (8)	$ 0
Count, total	1	1
Fair value, total	$ 217	$ 225
Unrealized loss, total	$ (8)	$ (15)
US Treasury Securities [Member]
Count, less than 12 months	0	147
Collateralized mortgage obligations - residential, fair value	$ 0	$ 104,439
Unrealized loss, less than 12 months	$ 0	$ (4,104)
Count, 12 months or more	170	53
Fair value, 12 months or more	$ 112,508	$ 58,664
Unrealized loss, 12 months or more	$ (3,412)	$ (3,699)
Count, total	170	200
Fair value, total	$ 112,508	$ 163,103
Unrealized loss, total	$ (3,412)	$ (7,803)
US Government-sponsored Enterprises Debt Securities [Member]
Count, less than 12 months	2	9
Collateralized mortgage obligations - residential, fair value	$ 8,987	$ 39,699
Unrealized loss, less than 12 months	$ (13)	$ (301)
Count, 12 months or more	4	0
Fair value, 12 months or more	$ 17,951	$ 0
Unrealized loss, 12 months or more	$ (49)	$ 0
Count, total	6	9
Fair value, total	$ 26,938	$ 39,699
Unrealized loss, total	$ (62)	$ (301)
Residential Mortgage-Backed Securities [Member]
Count, less than 12 months	0	18
Collateralized mortgage obligations - residential, fair value	$ 0	$ 3,016
Unrealized loss, less than 12 months	$ 0	$ (143)
Count, 12 months or more	17	0
Fair value, 12 months or more	$ 2,627	$ 0
Unrealized loss, 12 months or more	$ (91)	$ 0
Count, total	17	18
Fair value, total	$ 2,627	$ 3,016
Unrealized loss, total	$ (91)	$ (143)
Collateralized Mortgage-Backed Securities [Member]
Count, less than 12 months	0	5
Collateralized mortgage obligations - residential, fair value	$ 0	$ 1,009
Unrealized loss, less than 12 months	$ 0	$ (18)
Count, 12 months or more	6	1
Fair value, 12 months or more	$ 1,003	$ 171
Unrealized loss, 12 months or more	$ (20)	$ (8)
Count, total	6	6
Fair value, total	$ 1,003	$ 1,180
Unrealized loss, total	$ (20)	$ (26)

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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