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Note 2 - Investment Securities (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Mar. 31, 2022 | Mar. 31, 2021 | Oct. 31, 2021
Available-for-Sale, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage |  | 5.90% |  |
Held-to-maturity, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage |  | 5.20% |  |
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 |
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 Gain |  | 63,000 | 234,000 |
Equity Securities, FV-NI, Current |  | 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 |  |  |  | $ 880,000

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- Definition The held to maturity securities in unrealized loss positions depreciation from amortized cost percentage. + References No definition available. + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27357-111563 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27357-111563 + Details
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