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Note 1 - Basis of Presentation (Details Textual) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($)
Number of Operating Segments |  |  |  | 1 |
Interchange Income (Expense), Net | $ 1,470 |  | $ 1,300 | $ 2,800 | $ 2,530
Interchange Income | 1,950 |  | 1,720 | 3,720 | 3,330
Interchange Expense | $ 487 |  | $ 421 | $ 915 | $ 799
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 June 30, 2017 [Member] |  |  |  |  |
Prior Period Reclassification Adjustment |  | $ 158 |  |  |
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] | Six Months Ended June 30, 2017 [Member] |  |  |  |  |
Prior Period Reclassification Adjustment |  | $ 315 |  |  |

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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