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Note 13 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax Expense (Benefit), Total	$ 1,496	$ 3,643	$ 1,890	$ 12,587
Effective Income Tax Rate Reconciliation, Percent, Total	16.40%	34.60%	14.70%	34.60%
Effective Income Tax Rate Reconciliation, Share-based Compensation, Windfall Tax Benefit, Amount	$ 100		$ 1,600
Effective Income Tax Rate Reconciliation, Share-based Compensation, Windfall Tax Benefit, Percentage			12.10%
Deferred Tax Assets, Valuation Allowance, Total	$ 0		$ 0		$ 0

X

- Definition

Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to windfall tax benefit for share-based compensation.

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Percentage of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to windfall tax benefit for share-based compensation.

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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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