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Note 13 - Income Taxes (Details Textual) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Liabilities, Net, Total	$ 387.8	$ 346.2
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	8.1	8.6	$ 14.4
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	3.9	$ 4.6	$ 5.7
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$ 5.8

X

- Definition

Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

+ References

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-Publisher FASB
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X

- Definition

The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

+ References

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- Definition

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.

+ References

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

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