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Note 9 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 35.00% |  |
Deferred Tax Liabilities, Net | $ 84,157 | $ 76,981 |
Deferred Tax Assets, Valuation Allowance | 1,219 | 1,219 |
Liability for Uncertainty in Income Taxes, Current | 2,800 | 3,200 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 800 | 900 |
Income Tax Expense (Benefit) | 10,386 | 21,822 | $ 14,774
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 2,400 | 2,700 |
Interest and Penalties Recognized for Uncertain Tax Positions [Member] |  |  |
Income Tax Expense (Benefit) | (100) | (200) | $ (100)
Deferred Tax Assets Excludes State Net Operating Loss Carry Forwards [Member] |  |  |
Deferred Tax Assets, Valuation Allowance | 0 | 0 |
State and Local Jurisdiction [Member] |  |  |
Tax Credit Carryforward, Amount | 300 |  |
Operating Loss Carryforwards | $ 78,100 |  |
State and Local Jurisdiction [Member] | Earliest Tax Year [Member] |  |  |
Open Tax Year | 2013 |  |
State and Local Jurisdiction [Member] | Latest Tax Year [Member] |  |  |
Open Tax Year | 2016 |  |
State and Local Jurisdiction [Member] | Deferred Tax Assets Related to State Net Operating Loss Carry Forwards [Member] |  |  |
Deferred Tax Assets, Valuation Allowance | $ 1,200 | $ 1,200 |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |  |  |
Tax Credit Carryforward, Amount | 7,600 |  |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Alternative Minimum Tax Credit Carry Forward [Member] |  |  |
Tax Credit Carryforward, Amount | $ 300 |  |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member] |  |  |
Open Tax Year | 2013 |  |
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member] |  |  |
Open Tax Year | 2016 |  |

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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=65882285&loc=d3e32537-109319 + Details
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- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=75116654&loc=d3e31931-109318 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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