Note 3 - Investment Securities Available for Sale (Details Textual)	6 Months Ended	12 Months Ended
Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain (Loss), before Tax	$ 29,355,000		$ 35,698,000
Available-for-sale Securities Income Tax Expense (Benefit) on Accumulated Gross Unrealized Gains Losses	$ 8,677,000		$ 10,553,000
Number of Securities Sold During Period	4	155	157
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 1,122,000	$ 114,838,000	$ 116,285,000
Debt Securities, Available-for-Sale, Realized Gain (Loss)	$ 3,000	$ (19,826,000)	$ (19,817,000)
Number of Securities Sold for Gain During the Period	1	9	10
Debt Securities, Available-for-Sale, Realized Gain	$ 5,000	$ 86,000	$ 115,000
Number of Securities Sold for Loss During the Period	3	146	147
Debt Securities, Available-for-Sale, Realized Loss	$ 2,000	$ 19,912,000	$ 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	311
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions	43
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions	178
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	$ 469,031,000		473,433,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest	439,676,000		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	419,992,000		225,313,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 395,999,000		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	94
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	$ 232,554,000		243,709,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 222,524,000		228,391,000
Commercial Mortgage Backed Securities Issued by US Government Agencies [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	48
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	$ 138,530,000		133,749,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 129,241,000		121,870,000
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	169
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss	$ 97,947,000		95,975,000
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 87,911,000		$ 87,474,000

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.