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Note 13 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Open Tax Year | 2015 2016 2017 |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 35.00% | 35.00%
Increase (Decrease) in Deferred Tax Liabilities Resulting From Tax Act |  | $ 6,200 |
Income Tax Expense (Benefit), Total | $ 12,305 | $ (2,613) | $ 1,498
Effective Income Tax Rate Reconciliation, Percent, Total | 26.70% | (16.00%) | 356.60%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount |  |  | $ 900
Income Taxes Paid, Net, Total | $ 11,300 | $ 9,400 | $ 1,000
Restatement Adjustment [Member] |  |  |
Income Tax Expense (Benefit), Total |  | $ (1,900) |

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