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Note 2 - Securities (Details Textual) $ in Thousands |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Weighted Average Re-pricing Term |  | 3 years 182 days |  | 4 years 219 days |
Debt Securities, Held-to-maturity, Fair Value, Total |  | $ 18,259 |  | $ 42,394 |
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax |  | (431) |  |  |
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Recognized in Earnings |  | 0 |  |  |
Debt Securities, Available-for-sale, Total |  | $ 114,568 |  | $ 99,857 | [1]
Accounting Standards Update 2017-12 [Member] |  |  |  |  |
Debt Securities, Held-to-maturity, Fair Value, Total | $ 23,000 |  |  |  |
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax | 431 |  |  |  |
Debt Securities, Available-for-sale, Total | $ 23,400 |  |  |  |
US Agency and Mortgage-backed Securities [Member] |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total |  | 33 |  | 83 |
Available-for-Sale Securities, Number of Securities |  | 90 |  | 90 |
Debt Securities, Held-to-maturity, Fair Value, Total |  | $ 13,069 |  | $ 26,551 |
Debt Securities, Available-for-sale, Total |  | $ 87,932 |  | $ 84,922 |
Municipal Bonds [Member] |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total |  | 1 |  | 56 |
Available-for-Sale Securities, Number of Securities |  | 81 |  | 82 |
Debt Securities, Held-to-maturity, Fair Value, Total |  | $ 3,670 |  | $ 14,334 |
Debt Securities, Available-for-sale, Total |  | $ 26,636 |  | $ 14,935 |
[1] | Derived from audited consolidated financial statements.

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- Definition Amount of 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 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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