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Note 3 - Debt Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Jan. 01, 2021	[1]
Securities available for sale, amortized cost	$ 295,045	$ 320,123
Securities available for sale, unrealized gains	29	24
Securities available for sale, unrealized losses	(14,113)	(19,798)
Securities available for sale, fair value	280,961	300,349	$ 83,358
US Government Agencies Debt Securities [Member]
Securities available for sale, amortized cost	5,750	1,500
Securities available for sale, unrealized gains	0	0
Securities available for sale, unrealized losses	(1)	(15)
Securities available for sale, fair value	5,749	1,485
US Treasury Securities [Member]
Securities available for sale, amortized cost	146,653	161,617
Securities available for sale, unrealized gains	16	0
Securities available for sale, unrealized losses	(843)	(4,353)
Securities available for sale, fair value	145,826	157,264
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale, amortized cost	19,528	23,480
Securities available for sale, unrealized gains	11	21
Securities available for sale, unrealized losses	(162)	(192)
Securities available for sale, fair value	19,377	23,309
Corporate Debt Securities [Member]
Securities available for sale, amortized cost	28,566	37,046
Securities available for sale, unrealized gains	0	0
Securities available for sale, unrealized losses	(1,485)	(2,189)
Securities available for sale, fair value	27,081	34,857
Mortgage-backed Agency Securities [Member]
Securities available for sale, amortized cost	94,548	96,480
Securities available for sale, unrealized gains	2	3
Securities available for sale, unrealized losses	(11,622)	(13,049)
Securities available for sale, fair value	$ 82,928	$ 83,434
[1] Per our analysis no ACL was necessary for investment securities available for sale.

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

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- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1))
-Publisher FASB
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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

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-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
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