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Note 1 - Basis of Presentation and Significant Accounting Policies (Details Textual) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Jan. 01, 2019 USD ($) | Dec. 31, 2017 USD ($)
Number of Operating Segments |  | 1 |  |
Reclassification of Treasury Stock |  |  |  |
Minimum Principal Balance of Loans for Quarterly Rating Review |  | 500 |  |
Restructured Loans, Reserves |  | $ 250 |  |
Lessee, Operating Lease, Term of Contract |  | 20 years |  |
Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member] |  |  |  |
Operating Lease, Right-of-Use Asset |  |  | $ 915 |
Operating Lease, Liability, Total |  |  | $ 915 |
Reclassification from AOCI to Retained Earnings [Member] | Twelve Months Ended December 31, 2017 [Member] |  |  |  |
Prior Period Reclassification Adjustment | $ 244 |  |  |
Accounting Standards Update 2016-15 [Member] | Twelve Months Ended December 31, 2017 [Member] | Reclassification of Non-service Components of Net Period Benefit Costs From Salaries and Employee Benefits to Other Expense [Member] |  |  |  |
Prior Period Reclassification Adjustment | 543 |  |  |
Accounting Standards Update 2016-15 [Member] | Twelve Months Ended December 31, 2017 [Member] | Reclassification of Proceeds from Bank Owned Life Insurance from Operating Activities to Investing Activities [Member] |  |  |  |
Prior Period Reclassification Adjustment | 2,640 |  |  |
Accounting Standards Update 2016-15 [Member] | Twelve Months Ended December 31, 2016 [Member] | Reclassification of Non-service Components of Net Period Benefit Costs From Salaries and Employee Benefits to Other Expense [Member] |  |  |  |
Prior Period Reclassification Adjustment | 523 |  |  |
Accounting Standards Update 2014-09 [Member] | Twelve Months Ended December 31, 2017 [Member] | Reclassification of Interchange Expense From Noninterest Expense to Net Against Interchange Income [Member] |  |  |  |
Prior Period Reclassification Adjustment | 1,680 |  |  |
Accounting Standards Update 2014-09 [Member] | Twelve Months Ended December 31, 2016 [Member] | Reclassification of Interchange Expense From Noninterest Expense to Net Against Interchange Income [Member] |  |  |  |
Prior Period Reclassification Adjustment | $ 1,530 |  |  |
Furniture and Fixtures [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 5 years |  |
Furniture and Fixtures [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 10 years |  |
Equipment, Computer Hardware and Software [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |  |
Equipment, Computer Hardware and Software [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 5 years |  |
Building and Building Improvements [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 7 years |  |
Building and Building Improvements [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 40 years |  |
Land Improvements [Member] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 20 years |  |
Other Assets [Member] |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount |  | $ 602 |  | $ 823
Investment in Federal Home Loan Bank (FHLB) and Federal Reserve Bank (FRB) Stock [Member] |  |  |  |
Investment Owned, at Cost |  | 7,780 |  | $ 9,900
Common Stock [Member] |  |  |  |
Reclassification of Treasury Stock |  | (5,375) |  |
Additional Paid-in Capital [Member] |  |  |  |
Reclassification of Treasury Stock |  | $ (106,853) |  |

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