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Note 3 - Investment Securities (Details Textual) - USD ($)	1 Months Ended	3 Months Ended
	Sep. 30, 2018	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Jul. 31, 2024
Debt Securities, Available-for-Sale and Held-to-Maturity, Allowance for Credit Loss		$ 0
Securities held to maturity, amortized cost		$ 7,000,000		$ 7,000,000	$ 2,000,000
Available-for-Sale, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage		8.00%
Held-to-maturity, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage		34.40%
Debt Securities, Available-for-Sale, Realized Gain		$ 31,000	$ 133,000
Debt Securities, Available-for-Sale, Realized Loss		86,000	101,000
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss		$ 2,100,000		$ 2,100,000
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]		Interest Receivable		Interest Receivable
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss		$ 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)		18,000	(68,000)
Equity Securities, FV-NI, Current		905,000,000,000		887,000,000,000
Investment Company, Financial Support to Investee Contractually Required, Not Provided, Amount		380,000		380,000
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		$ 965,000,000,000		$ 965,000,000,000

X

- Definition

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

+ References

No definition available.

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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 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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Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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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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