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Note 10 - Income Taxes (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  | 35.00% |  | 35.00%
Effective Income Tax Rate Reconciliation, Percent, Total | 26.50% | 40.70% | 26.20% | 40.60% |  |
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent |  |  | 4.50% | 4.30% |  |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent, Total |  |  | 1.00% | 1.30% |  |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent |  |  | 0.30% |  |  |
Income Taxes Paid, Net, Total |  |  | $ 26.8 | $ 1.2 |  |
Scenario, Forecast [Member] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  | 21.00% |

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