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Note 2 - Debt Securities (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Number of Securities in Unrealized Loss Position | 116 |  | 116 |  | 45
Percentage of Combined Depreciation of Combined Reported Value of Aggregate Securities Portfolio | 1.29% |  | 1.29% |  | 0.57%
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings, Total | $ 0 | $ 0 | $ 0 | $ 0 |
Security Owned and Pledged as Collateral, Fair Value, Total | $ 37,790 |  | $ 37,790 |  | $ 51,340

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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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