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Note 7 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Income Tax Expense (Benefit), Total $ (326) $ 79
Deferred Tax Assets, Valuation Allowance 2,416 2,697
Unrecognized Tax Benefits, Ending Balance 0 0
General Business Tax Credit Carryforward [Member]    
Tax Credit Carryforward, Amount   $ 2,600
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]    
Operating Loss Carryforwards $ 40,952  
Open Tax Year 2002 2005 2006 2007 2011 2012 2013 2014 2015  
Foreign Tax Authority [Member]    
Deferred Tax Assets, Valuation Allowance $ 0  
Open Tax Year 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021  
Foreign Tax Authority [Member] | Her Majesty's Revenue and Customs (HMRC) [Member]    
Operating Loss Carryforwards $ 10,000  
State and Local Jurisdiction [Member]    
Open Tax Year 2002 2005 2006 2007 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021