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Note 9 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 35.00% |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  | $ 40,100 |  |
Deferred Tax Liabilities, Net |  | 63,344 | $ 84,157 |
Deferred Tax Assets, Valuation Allowance |  | 63 | 1,219 |
Liability for Uncertainty in Income Taxes, Current |  | 2,800 | 2,800 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense |  | 800 | 800 |
Income Tax Expense (Benefit) |  | (32,142) | 10,386 | $ 21,822
Unrecognized Tax Benefits that Would Impact Effective Tax Rate |  | 2,500 | 2,400 |
Interest and Penalties Recognized for Uncertain Tax Positions [Member] |  |  |  |
Income Tax Expense (Benefit) |  | (100) | 100 | $ (200)
State and Local Jurisdiction [Member] |  |  |  |
Tax Credit Carryforward, Amount |  | 500 |  |
Operating Loss Carryforwards |  | 91,100 |  |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |  |  |
Tax Credit Carryforward, Amount |  | 10,500 |  |
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] | Earliest Tax Year [Member] |  |  |  |
Open Tax Year |  | 2014 |  |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member] |  |  |  |
Open Tax Year |  | 2017 |  |
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 |  | 0 | 0 |
Deferred Tax Assets Related to State Net Operating Loss Carry Forwards [Member] | State and Local Jurisdiction [Member] |  |  |  |
Deferred Tax Assets, Valuation Allowance |  | $ 100 | $ 1,200 |
Scenario, Forecast [Member] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |  |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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