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Note 8 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00% | 35.00%
Deferred Tax Liabilities, Net, Total | $ 80,330 | $ 77,467 |
Deferred Tax Assets, Valuation Allowance, Total | 385 | 63 |
Liability for Uncertainty in Income Taxes, Current | 900 | 2,700 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total | 100 | 900 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total | 800 | 100 | $ 100
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 900 | $ 2,500 |
Charitable Contributions Carryforward | 2,100 |  |
Alternative Minimum Tax Credit Carry Forward [Member] |  |  |
Tax Credit Carryforward, Amount | 1,200 |  |
State and Local Jurisdiction [Member] |  |  |
Operating Loss Carryforwards, Total | 115,700 |  |
Tax Credit Carryforward, Amount | 600 |  |
Domestic Tax Authority [Member] |  |  |
Operating Loss Carryforwards, Total | 103,900 |  |
Operating Loss Carryforwards, Subject to Expiration | 1,400 |  |
Operating Loss Carryforwards, Not Subject to Expiration | 102,500 |  |
Tax Credit Carryforward, Amount | 10,400 |  |
Deferred Tax Assets Related to State Net Operating Loss Carry Forwards [Member] | State and Local Jurisdiction [Member] |  |  |
Deferred Tax Assets, Valuation Allowance, Total | $ 400 |  |

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