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Note 12 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Deferred Tax Assets, Valuation Allowance, Total $ 11,364 $ 11,188  
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 200    
Operating Loss Carryforwards, Total 700    
Tax Credit Carryforward, Amount 15,500    
Unrecognized Tax Benefits that Would Impact Effective Tax Rate $ 4,900 $ 4,600 $ 4,200
Open Tax Year 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020    
Foreign Tax Authority [Member]      
Tax Credit Carryforward, Amount $ 900