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Note 13 - Income Taxes (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Effective Income Tax Rate Reconciliation, Percent, Total 35.70% 29.90% 29.70% 0.10%  
Unrecognized Tax Benefits, Ending Balance $ 5.0   $ 5.0   $ 3.1
Foreign Tax Authority [Member]          
Income Tax Examination, Year under Examination     2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019