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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)

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

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