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Note 3 - Investment Securities (Details Textual) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale and Held-to-Maturity, Allowance for Credit Loss		$ 0	$ 0	$ 0	$ 0
Available-for-Sale, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage		6.80%		6.80%
Held-to-maturity, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage		33.00%		33.00%
Debt Securities, Available-for-Sale, Realized Gain		$ 0	1,000	$ 133,000	79,000
Debt Securities, Available-for-Sale, Realized Loss			95,000	101,000	187,000
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss		$ 1,900,000		$ 1,900,000			$ 2,400,000
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]		Interest Receivable		Interest Receivable			Interest Receivable
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss		$ 18,000		$ 18,000			$ 18,000
Investment, Number of Shares Acquired	90,000
Investment Ownership Percentage	5.00%
Payments to Acquire Other Investments	$ 1,900,000
Equity Securities, FV-NI, Unrealized Gain (Loss)		(196,000)	(131,000)	(270,000)	(86,000)
Equity Securities, FV-NI, Current		990,000,000,000		990,000,000,000			1,300,000
Investment Company, Financial Support to Investee Contractually Required, Not Provided, Amount						$ 430,000	530,000
Peoples Bancorp, Inc [Member] | Class B Shares of VISA [Member]
Equity Securities, FV-NI, Realized Gain (Loss)			157,000		157,000
Limited Partnership Interest, Technology Fund [Member]
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount		0	$ 0	0	$ 0
Limited Partnership Interest, Technology Fund [Member] | Other Assets [Member]
Equity Securities without Readily Determinable Fair Value, Amount		$ 1,000,000		$ 1,000,000			$ 1,000,000

X

- Definition

This item represents the depreciated percentage of available-for-sale investments in a loss position from amortized cost.

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The held to maturity securities in unrealized loss positions depreciation from amortized cost percentage.

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Amount, after allowance for credit loss, of accrued interest 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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Amount of allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity) and 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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Amount of realized gain 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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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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Amount of financial support committed by investment company to investee that is contractually required but not provided.

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