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Note 4 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Jun. 30, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 21.00% | 35.00% |  |
Income Tax Expense (Benefit), Total | $ 4,249 | $ 2,985 | $ 9,716 | $ 3,530 |  |
Deferred Tax Liabilities, Net, Total | $ 73,300 |  | 73,300 |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  |  |  | $ 40,100 |
State and Local Jurisdiction [Member] | Deferred Tax Assets Related to State Net Operating Loss Carry Forwards [Member] |  |  |  |  |  |
Deferred Tax Assets, Valuation Allowance, Total |  |  |  |  |  | $ 100
Interest and Penalties Recognized for Uncertain Tax Positions [Member] |  |  |  |  |  |
Income Tax Expense (Benefit), Total |  |  | $ (100) |  |  |

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