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Note 7 - Investment Securities (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Interest Receivable | $ 56,844 |  | $ 56,844 |  | $ 59,032
Equity Securities, FV-NI, Unrealized Gain (Loss), Total | 3 | $ 1,600 | (3,628) | $ (1,928) |
Equity Securities, FV-NI, Current | 20,117 |  | 20,117 |  | 23,744
Debt Securities, Available-for-sale, Restricted | 30,900 |  | 30,900 |  | $ 22,700
Debt Securities, Available-for-sale [Member] |  |  |  |  |
Interest Receivable | $ 2,600 |  | $ 2,600 |  |

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- Definition Amount of restricted 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 954 -SubTopic 210 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=120413173&loc=SL6242262-115580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 210 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120413209&loc=SL6242269-115581 + Details
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