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Note 4 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 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	$ 1,538	$ (708)
Deferred Tax Liabilities, Net, Total	65,500
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	$ (200)

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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