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Note 3 - Debt Securities (Details Textual) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Number of Securities in Unrealized Loss Position | 90 | 45 |
Percentage of Combined Depreciation of Combined Reported Value of Aggregate Securities Portfolio | 0.74% | 0.57% |
Number of Securities in Unrealized Loss Position, Greater than or Equal to One Year | 61 |  |
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings, Total | $ 0 | $ 0 | $ 4,640
Security Owned and Pledged as Collateral, Fair Value, Total | $ 38,250 | $ 51,340 |

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- Definition Number of investment positions that have been in a continuous unrealized loss position for greater than or equal to a year. + References No definition available. + Details
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- Definition Represents the percentage of combined depreciation of combined reported value of aggregate securities portfolio. + References No definition available. + Details
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- Definition Amount of other-than-temporary impairment (OTTI) on investment in debt security, recognized in earnings. + 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=109979856&loc=SL6284422-111562 + Details
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- Definition Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 + Details
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