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Note 3 - Investment Securities Available for Sale (Details Textual)	9 Months Ended		12 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain (Loss), before Tax	$ 23,411,000		$ 35,698,000
Available-for-sale Securities Income Tax Expense (Benefit) on Accumulated Gross Unrealized Gains Losses	$ 6,920,000		$ 10,553,000
Number of Securities Sold During Period	90	157	157
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 88,009,000	$ 116,285,000	$ 116,285,000
Debt Securities, Available-for-Sale, Realized Gain (Loss)	(625,000)	$ (19,817,000)	$ (19,817,000)
Gain (Loss) on Fair Value Hedges Recognized in Earnings	$ 254,000
Number of Securities Sold for Gain During the Period	15	10	10
Debt Securities, Available-for-Sale, Realized Gain	$ 36,000	$ 115,000	$ 115,000
Number of Securities Sold for Loss During the Period	75	147	147
Debt Securities, Available-for-Sale, Realized Loss	$ 661,000	$ 19,932,000	$ 19,932,000
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss	$ 0		0
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	326
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	22
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	173
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	$ 508,097,000		473,433,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest	484,686,000		437,735,000
Asset Pledged as Collateral [Member] | Deposits and Repurchase Agreements [Member]
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	440,935,000		225,313,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 421,337,000		212,001,000
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	101
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	$ 258,397,000		243,709,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 250,865,000		228,391,000
Commercial Mortgage Backed Securities Issued by US Government Agencies [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	51
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	$ 147,614,000		133,749,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 138,938,000		121,870,000
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	174
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	$ 102,086,000		95,975,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 94,883,000		$ 87,474,000

X

- Definition

This item represents the tax expense (benefit) occurring during the period which are related to the gross unrealized gain (loss) resulting from changes in the fair [carrying] value during the period of available-for-sale securities. Such tax effects would have been charged or credited directly to accumulated other comprehensive income or to related components of shareholders' equity.

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Amount, before tax, of unrealized gain (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).

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-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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