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Note 3 - Investment Securities (Details Textual) - USD ($)	1 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Oct. 31, 2021
Debt Securities, Available-for-Sale, Amortized Cost, Total		$ 507,466,000	$ 445,220,000
Available-for-Sale, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage		9.60%
Held-to-maturity, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage		24.10%
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total		$ 0
Debt Securities, Available-for-sale, Realized Gain			12,000
Debt Securities, Available-for-sale, Realized Loss			5,000
Proceeds from Sale of Debt Securities, Available-for-Sale		0	1,798,000	$ 0
Investment, Number of Shares Acquired (in shares)	90,000
Investment Ownership Percentage	5.00%
Payments to Acquire Other Investments	$ 1,900,000
Equity Securities, FV-NI, Unrealized Loss		414,000		$ 194,000
Equity Securities, FV-NI, Unrealized Gain			328,000
Equity Securities, FV-NI, Current		1,500,000	1,900,000
Limited Partnership Interest, Technology Fund [Member]
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount		0	0
Limited Partnership Interest, Technology Fund [Member] | Other Assets [Member]
Equity Securities without Readily Determinable Fair Value, Amount					$ 1,000,000.0
Limited Partnership Interest, Technology Fund [Member] | Other Liabilities [Member]
Investment Company, Financial Commitment to Investee, Future Amount		780,000	$ 880,000
Collateral Pledged [Member]
Debt Securities, Available-for-Sale, Amortized Cost, Total		112,100,000
Debt Securities, Available-for-Sale, Restricted		$ 104,000,000.0

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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Amortized cost of 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 loss 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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