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Note 3 - Debt Securities - Available For Sale Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Securities available for sale, less than 12 months, fair value	$ 19,523	$ 25,329
Securities available for sale, less than 12 months, unrealized losses	(85)	(45)
Securities available for sale, 12 months or longer, fair value	134,911	239,992
Securities available for sale, 12 months or longer, unrealized losses	(15,203)	(14,068)
Securities available for sale, total fair value	154,434	265,321
Securities available for sale, total unrealized losses	(15,288)	(14,113)
US Government Agencies Debt Securities [Member]
Securities available for sale, less than 12 months, fair value	5,750	5,749
Securities available for sale, less than 12 months, unrealized losses	0	(1)
Securities available for sale, 12 months or longer, fair value	0	0
Securities available for sale, 12 months or longer, unrealized losses	0	0
Securities available for sale, total fair value	5,750	5,749
Securities available for sale, total unrealized losses	0	(1)
US Treasury Securities [Member]
Securities available for sale, less than 12 months, fair value	5,283	11,417
Securities available for sale, less than 12 months, unrealized losses	(12)	(14)
Securities available for sale, 12 months or longer, fair value	25,684	129,108
Securities available for sale, 12 months or longer, unrealized losses	(50)	(829)
Securities available for sale, total fair value	30,967	140,525
Securities available for sale, total unrealized losses	(62)	(843)
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale, less than 12 months, fair value	3,944	4,742
Securities available for sale, less than 12 months, unrealized losses	(21)	(20)
Securities available for sale, 12 months or longer, fair value	7,713	5,484
Securities available for sale, 12 months or longer, unrealized losses	(196)	(142)
Securities available for sale, total fair value	11,657	10,226
Securities available for sale, total unrealized losses	(217)	(162)
Corporate Debt Securities [Member]
Securities available for sale, less than 12 months, fair value	0	0
Securities available for sale, less than 12 months, unrealized losses	0	0
Securities available for sale, 12 months or longer, fair value	26,916	27,081
Securities available for sale, 12 months or longer, unrealized losses	(1,658)	(1,485)
Securities available for sale, total fair value	26,916	27,081
Securities available for sale, total unrealized losses	(1,658)	(1,485)
Mortgage-backed Agency Securities [Member]
Securities available for sale, less than 12 months, fair value	4,546	3,421
Securities available for sale, less than 12 months, unrealized losses	(52)	(10)
Securities available for sale, 12 months or longer, fair value	74,598	78,319
Securities available for sale, 12 months or longer, unrealized losses	(13,299)	(11,612)
Securities available for sale, total fair value	79,144	81,740
Securities available for sale, total unrealized losses	$ (13,351)	$ (11,622)

X

- Definition

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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