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Note 3 - Investment Securities (Details Textual) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) shares | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Oct. 31, 2021 USD ($)
Debt Securities, Available-for-sale, Amortized Cost, Total |  | $ 445,220,000 | $ 274,709,000 |  |
Number of Holdings of Securities with an Aggregate Book Value Greater than 10% of Stockholders' Equity |  | 0 | 0 |  |
Available-for-Sale, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage |  | 1.40% |  |  |
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total |  | $ 0 |  |  |
Debt Securities, Available-for-sale, Realized Gain |  | 12,000 |  | $ 22,000 |
Debt Securities, Available-for-sale, Realized Loss |  | 5,000 |  | 156,000 |
Proceeds from Sale of Debt Securities, Available-for-sale |  | 1,798,000 | $ 0 | 21,725,000 |
Investment, Number of Shares Acquired (in shares) | shares | 90,000 |  |  |  |
Investment Ownership Percentage | 5.00% |  |  |  |
Payments to Acquire Other Investments | $ 1,900,000 |  |  |  |
Equity Securities, FV-NI, Unrealized Gain |  | 328,000 |  | $ 32,000 |
Equity Securities, FV-NI, Unrealized Loss |  |  | 194,000 |  |
Equity Securities, FV-NI, Current |  | 1,900,000 | $ 1,600,000 |  |
Limited Partnership Interest, Technology Fund [Member] |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount |  | 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
Collateral Pledged [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost, Total |  | 101,700,000 |  |  |
Debt Securities, Available-for-sale, Restricted |  | $ 100,900,000 |  |  |

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- Definition Amortized cost of 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 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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