Note 2 - Investment Securities - Amortized Cost and Fair Value on Available-for-sale (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Available for sale, amortized cost	$ 213,570	$ 242,461
Available for sale, gross unrealized gains	2	0
Available for sale, gross unrealized losses	35,777	41,139
Available for sale, estimated fair value	177,795	201,322
Collateralized Mortgage-Backed Securities [Member]
Available for sale, amortized cost	94,255	107,055
Available for sale, gross unrealized gains	0	0
Available for sale, gross unrealized losses	9,883	10,083
Available for sale, estimated fair value	84,372	96,972
US States and Political Subdivisions Debt Securities [Member]
Available for sale, amortized cost	118,815	134,906
Available for sale, gross unrealized gains	2	0
Available for sale, gross unrealized losses	25,839	30,993
Available for sale, estimated fair value	92,978	103,913
Other Debt Obligations [Member]
Available for sale, amortized cost	500	500
Available for sale, gross unrealized gains	0	0
Available for sale, gross unrealized losses	55	63
Available for sale, estimated fair value	$ 445	$ 437

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).

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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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
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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