Note 3 - Investment Securities Available for Sale (Details Textual)	6 Months Ended	12 Months Ended
Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)	Mar. 31, 2026 USD ($)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain (Loss), before Tax	$ 19,282,000		$ 14,895,000
Available-for-sale Securities Income Tax Expense (Benefit) on Accumulated Gross Unrealized Gains Losses	$ 5,700,000		$ 4,404,000
Number of Securities Sold During Period	0	4	135
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 0	$ 1,122,000	$ 130,635,000
Debt Securities, Available-for-Sale, Realized Gain (Loss)		$ 3,000	$ (6,065,000)
Number of Securities Sold for Gain During the Period		1	15
Debt Securities, Available-for-Sale, Realized Gain		$ 5,000	$ 36,000
Number of Securities Sold for Loss During the Period		3	120
Debt Securities, Available-for-Sale, Realized Loss		$ 2,000	$ 6,101,000
Gain (Loss) on Fair Value Hedges Recognized in Earnings			254,000
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	298
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	56
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	105
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	$ 485,273,000		491,490,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest	465,991,000		476,595,000
Federal Reserve Bank Advances [Member] \| Federal Reserve Bank Discount Window Program [Member]
Short-Term Debt	0		0
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	423,691,000		400,458,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 407,083,000		388,357,000
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	92
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	$ 242,548,000		257,520,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 234,965,000		253,165,000
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	$ 150,585,000		141,861,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 142,106,000		134,764,000
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	155
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	$ 92,140,000		92,109,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 88,920,000		$ 88,666,000

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.

No definition available.