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Note 11 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Income Tax Expense (Benefit), Total	$ 3,855	$ 5,797
Effective Income Tax Rate Reconciliation, Percent, Total	17.60%	32.20%
Effective Income Tax Rate, Increase (Decrease), Percentage	(14.60%)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%			35.00%
Unrecognized Tax Benefits, Ending Balance	$ 4,200			$ 4,200
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%

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The increase (decrease) in the effective income tax rate during the period.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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