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Note 2 - Investment Securities (Details Textual)	3 Months Ended
	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 0	$ 0
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 274,887,000		$ 281,692,000
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	252		241
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	$ 0		$ 0
Asset Pledged as Collateral without Right [Member]
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 19,694,000		$ 19,976,000

X

- Definition

Amount excluding accrued interest, of allowance for credit loss 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 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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X

- 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
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-Section S45
-Paragraph 1
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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X

- Definition

Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

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X

- Definition

Amount of cash inflow from sale 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
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