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Note 2 - Debt Securities (Details Textual) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Number of Securities in Unrealized Loss Position | 105 |  | 45
Percentage of Combined Depreciation of Combined Reported Value of Aggregate Securities Portfolio | 1.14% |  | 0.57%
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings, Total | $ 0 | $ 0 |
Security Owned and Pledged as Collateral, Fair Value, Total | 41,390 |  | $ 51,340
Available-for-sale Securities, Gross Realized Losses | 0 |  |
Available-for-sale Securities, Gross Realized Gains | $ 0 | $ 0 |

X
- Definition Represents the number of securities in unrealized loss position. + 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 This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + 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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