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Note 4 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%	35.00%
Income Tax Expense (Benefit), Total	$ 3,928	$ 1,253	$ 5,467	$ 545
Deferred Tax Liabilities, Net, Total	70,600		70,600
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		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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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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