Note 16 - Income Taxes (Details Textual) - USD ($) $ in Millions	12 Months Ended		36 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 2.2	$ 0.9	$ 10.1
Domestic Tax Authority [Member]
Open Tax Year	2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018
State and Local Jurisdiction [Member]
Open Tax Year	2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018