Note 3 - Securities - Securities With Unrealized Losses (Details) $ in Thousands	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Count, less than 12 months	29	180
Collateralized mortgage obligations - residential, fair value	$ 46,579	$ 148,388
Unrealized loss, less than 12 months	$ (396)	$ (4,581)
Count, 12 months or more	186	54
Fair value, 12 months or more	$ 119,855	$ 58,835
Unrealized loss, 12 months or more	$ (5,795)	$ (3,707)
Count, total	215	234
Fair value, total	$ 166,434	$ 207,223
Unrealized loss, total	$ (6,191)	$ (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	$ 227	$ 0
Unrealized loss, 12 months or more	$ (13)	$ 0
Count, total	1	1
Fair value, total	$ 227	$ 225
Unrealized loss, total	$ (13)	$ (15)
US Treasury Securities [Member]
Count, less than 12 months	2	147
Collateralized mortgage obligations - residential, fair value	$ 4,170	$ 104,439
Unrealized loss, less than 12 months	$ (53)	$ (4,104)
Count, 12 months or more	179	53
Fair value, 12 months or more	$ 118,195	$ 58,664
Unrealized loss, 12 months or more	$ (5,719)	$ (3,699)
Count, total	181	200
Fair value, total	$ 122,365	$ 163,103
Unrealized loss, total	$ (5,772)	$ (7,803)
US Government-sponsored Enterprises Debt Securities [Member]
Count, less than 12 months	9	9
Collateralized mortgage obligations - residential, fair value	$ 39,739	$ 39,699
Unrealized loss, less than 12 months	$ (261)	$ (301)
Count, 12 months or more	0	0
Fair value, 12 months or more	$ 0	$ 0
Unrealized loss, 12 months or more	$ 0	$ 0
Count, total	9	9
Fair value, total	$ 39,739	$ 39,699
Unrealized loss, total	$ (261)	$ (301)
Residential Mortgage-Backed Securities [Member]
Count, less than 12 months	14	18
Collateralized mortgage obligations - residential, fair value	$ 2,414	$ 3,016
Unrealized loss, less than 12 months	$ (78)	$ (143)
Count, 12 months or more	2	0
Fair value, 12 months or more	$ 539	$ 0
Unrealized loss, 12 months or more	$ (46)	$ 0
Count, total	16	18
Fair value, total	$ 2,953	$ 3,016
Unrealized loss, total	$ (124)	$ (143)
Collateralized Mortgage-Backed Securities [Member]
Count, less than 12 months	4	5
Collateralized mortgage obligations - residential, fair value	$ 256	$ 1,009
Unrealized loss, less than 12 months	$ (4)	$ (18)
Count, 12 months or more	4	1
Fair value, 12 months or more	$ 894	$ 171
Unrealized loss, 12 months or more	$ (17)	$ (8)
Count, total	8	6
Fair value, total	$ 1,150	$ 1,180
Unrealized loss, total	$ (21)	$ (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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