Note 2 - Investment Securities - Schedule of Held-to-maturity Investment Securities with Credit Rating (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Held-to-maturity, Amortized cost	$ 13,785	$ 13,798
Nontaxable Municipal Bonds [Member]
Held-to-maturity, Amortized cost	13,785	13,798
Nontaxable Municipal Bonds [Member] \| Standard & Poor's, AAA Rating [Member]
Held-to-maturity, Amortized cost	13,785	13,798
Subordinated Debt [Member]
Held-to-maturity, Amortized cost	13,785	13,798
Subordinated Debt [Member] \| Standard & Poor's, AAA Rating [Member]
Held-to-maturity, Amortized cost	$ 13,785	$ 13,798

Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-14

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482736/825-10-45-1A

Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-7A

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant