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Note 2 - Investment Securities - Summary of Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Amortized cost	$ 295,079	$ 299,162
Securities available-for-sale, gross unrealized gains	301	404
Securities available-for-sale, gross unrealized losses	(20,493)	(17,874)
Securities available-for-sale, ACL	0	0
Securities available-for-sale, at fair value (amortized cost of $295,079 at March 31, 2026 and $299,162 at December 31, 2025)	274,887	281,692
US Government Agencies Debt Securities [Member]
Amortized cost	4,023	4,179
Securities available-for-sale, gross unrealized gains	61	62
Securities available-for-sale, gross unrealized losses	(116)	(86)
Securities available-for-sale, ACL	0	0
Securities available-for-sale, at fair value (amortized cost of $295,079 at March 31, 2026 and $299,162 at December 31, 2025)	3,968	4,155
US Treasury and Government [Member]
Amortized cost	47,675	47,665
Securities available-for-sale, gross unrealized gains	0	0
Securities available-for-sale, gross unrealized losses	(3,749)	(3,357)
Securities available-for-sale, ACL	0	0
Securities available-for-sale, at fair value (amortized cost of $295,079 at March 31, 2026 and $299,162 at December 31, 2025)	43,926	44,308
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	126,641	127,469
Securities available-for-sale, gross unrealized gains	1	53
Securities available-for-sale, gross unrealized losses	(10,826)	(9,198)
Securities available-for-sale, ACL	0	0
Securities available-for-sale, at fair value (amortized cost of $295,079 at March 31, 2026 and $299,162 at December 31, 2025)	115,816	118,324
Corporate Debt Securities [Member]
Amortized cost	2,000	2,000
Securities available-for-sale, gross unrealized gains	0	0
Securities available-for-sale, gross unrealized losses	(30)	(29)
Securities available-for-sale, ACL	0	0
Securities available-for-sale, at fair value (amortized cost of $295,079 at March 31, 2026 and $299,162 at December 31, 2025)	1,970	1,971
Collateralized Mortgage-Backed Securities [Member]
Amortized cost	26,684	27,222
Securities available-for-sale, gross unrealized gains	157	180
Securities available-for-sale, gross unrealized losses	(1,064)	(908)
Securities available-for-sale, ACL	0	0
Securities available-for-sale, at fair value (amortized cost of $295,079 at March 31, 2026 and $299,162 at December 31, 2025)	25,777	26,494
Collateralized Mortgage Obligations [Member]
Amortized cost	81,569	83,907
Securities available-for-sale, gross unrealized gains	37	49
Securities available-for-sale, gross unrealized losses	(4,707)	(4,295)
Securities available-for-sale, ACL	0	0
Securities available-for-sale, at fair value (amortized cost of $295,079 at March 31, 2026 and $299,162 at December 31, 2025)	76,899	79,661
Asset-Backed Securities [Member]
Amortized cost	6,487	6,720
Securities available-for-sale, gross unrealized gains	45	60
Securities available-for-sale, gross unrealized losses	(1)	(1)
Securities available-for-sale, ACL	0	0
Securities available-for-sale, at fair value (amortized cost of $295,079 at March 31, 2026 and $299,162 at December 31, 2025)	$ 6,531	$ 6,779

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

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+ 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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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

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- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, 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 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

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- Definition

Amount excluding accrued interest, 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 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1

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/1943274/2147478546/942-210-S99-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

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