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Note 8 - Income Taxes (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	23.90%	20.40%	23.90%	24.30%
Unrecognized Tax Benefits, Ending Balance	$ 52.4		$ 52.4
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	43.2		43.2
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	$ 5.3		$ 5.3

X

- Definition

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

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Amount of unrecognized tax benefits.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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