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Note 3 - Investment Securities (Details Textual) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Available-for-sale Securities Pledged as Collateral, Amortized Cost |  | $ 54,000,000.0 |  |
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 |  | 0.20% |  |
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total |  | $ 0 |  |
Debt Securities, Available-for-sale, Realized Loss |  | 0 | $ 156,000 | $ 313,000
Debt Securities, Available-for-sale, Realized Gain |  |  | 22,000 | 218,000
Investment, Number of Shares Acquired (in shares) | shares | 90,000 |  |  |
Investment Ownership Percentage | 5.00% |  |  |
Payments to Acquire Other Investments | $ 1,900,000 | (0) | (0) | 1,922,000
Equity Securities, FV-NI, Unrealized Gain |  | 194,000 | 32,000 | $ 207,000
Equity Securities, FV-NI |  | 1,600,000 | $ 1,700,000 |
Securities Available for Sale [Member] |  |  |  |
Debt Securities, Available-for-sale, Restricted |  | $ 55,100,000 |  |

X
- Definition This item represents the depreciated percentage of available-for-sale investments in a loss position from amortized cost. + References No definition available. + Details
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- Definition The amortized cost of available-for-sale securities that serve as collateral for borrowings. + References No definition available. + Details
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- Definition Represents number of shares acquired in investment. + References No definition available. + Details
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- Definition Represents the investment ownership percentage. + References No definition available. + Details
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- Definition Represents the total number of holdings of securities with an aggregate book value greater than 10% of stockholders' equity other than the U.S. Government and its agencies. + 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 http://asc.fasb.org/extlink&oid=121645371&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 http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563 + Details
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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 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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- Definition Amount of unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117546-209714 + Details
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- Definition Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings and other comprehensive loss (OCI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=121553693&loc=SL6284422-111562 + Details
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