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Note 1 - Basis of Presentation (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Goodwill, Impairment Loss | $ 1,490 |  | $ 1,492 |
Number of Operating Segments |  |  | 1 |
Accounting Standards Update 2017-07 [Member] | Reclassification of Non-service Components of Net Period Benefit Costs From Salaries and Employee Benefits to Other Expense [Member] | Three Months Ended September 30, 2017 [Member] |  |  |  |
Prior Period Reclassification Adjustment |  | $ 136 |  |
Accounting Standards Update 2017-07 [Member] | Reclassification of Non-service Components of Net Period Benefit Costs From Salaries and Employee Benefits to Other Expense [Member] | Nine Months Ended September 30, 2017 [Member] |  |  |  |
Prior Period Reclassification Adjustment |  | 407 |  |
Accounting Standards Update 2016-15 [Member] | Reclassification of Proceeds from Bank Owned Life Insurance from Operating Activities to Investing Activities [Member] | Nine Months Ended September 30, 2017 [Member] |  |  |  |
Prior Period Reclassification Adjustment |  | $ 2,640 |  |
Accounting Standards Update 2014-09 [Member] | Reclassification of Interchange Expense From Noninterest Expense to Net Against Interchange Income [Member] | Three Months Ended September 30, 2017 [Member] |  |  |  |
Prior Period Reclassification Adjustment |  |  | $ 432 |
Accounting Standards Update 2014-09 [Member] | Reclassification of Interchange Expense From Noninterest Expense to Net Against Interchange Income [Member] | Nine Months Ended September 30, 2017 [Member] |  |  |  |
Prior Period Reclassification Adjustment |  |  | $ 1,230 |

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