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Note 8 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 35.00% |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  | $ 40,100 |
Deferred Tax Liabilities, Net, Total | $ 77,467 | 63,344 |
Deferred Tax Assets, Valuation Allowance, Total | 63 | 63 |
Liability for Uncertainty in Income Taxes, Current | 2,700 | 2,800 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total | 900 | 800 |
Income Tax Expense (Benefit), Total | 15,507 | (32,142) | $ 10,386
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 2,500 | 2,500 |
Interest and Penalties Recognized for Uncertain Tax Positions [Member] |  |  |
Income Tax Expense (Benefit), Total | 100 | (100) | $ 100
State and Local Jurisdiction [Member] |  |  |
Tax Credit Carryforward, Amount | 700 |  |
Operating Loss Carryforwards, Total | $ 75,700 |  |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |  |
Open Tax Year | 2013 2015 2016 2017 2018 |  |
Tax Credit Carryforward, Amount | $ 12,000 |  |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Alternative Minimum Tax Credit Carry Forward [Member] |  |  |
Tax Credit Carryforward, Amount | 1,000 |  |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Tax Year 2013 [Member] |  |  |
Tax Credit Carryforward, Amount Under Audit | 6,500 |  |
Deferred Tax Assets Excludes State Net Operating Loss Carry Forwards [Member] |  |  |
Deferred Tax Assets, Valuation Allowance, Total | 0 | 0 |
Deferred Tax Assets Related to State Net Operating Loss Carry Forwards [Member] | State and Local Jurisdiction [Member] |  |  |
Deferred Tax Assets, Valuation Allowance, Total | $ 100 | $ 100 |

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