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Note 9 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Expense (Benefit), Total | $ 81 | $ 130 |  |
Effective Income Tax Rate Reconciliation, Percent, Total | 16.40% | 24.30% |  |
Deferred Tax Assets, Net, Total | $ 5,900 |  |  | $ 5,600
Scenario, Forecast [Member] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 21.00% |

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