Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Income Taxes (Details Textual)

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Note 11 - Income Taxes (Details Textual) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Percent, Total 27.10% 25.00%  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     21.00%
Unrecognized Tax Benefits, Ending Balance $ 23.9   $ 23.9
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 8.2   8.2
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total 2.8   2.5
Liability for Uncertainty in Income Taxes, Noncurrent $ 26.7   $ 26.4
Domestic Tax Authority [Member]      
Open Tax Year 2015 2016 2017 2018    
State and Local Jurisdiction [Member]      
Open Tax Year 2014 2015 2016 2017 2018