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Note 10 - Income Taxes (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent				35.00%		35.00%
Effective Income Tax Rate Reconciliation, Percent, Total	26.50%	40.70%	26.20%	40.60%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent			4.50%	4.30%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent, Total			1.00%	1.30%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent			0.30%
Income Taxes Paid, Net, Total			$ 26.8	$ 1.2
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent					21.00%

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- Definition

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

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses.

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