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Note 2 - Income Tax Expense (Details Textual) - USD ($)
9 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Unrecognized Tax Benefits, Ending Balance $ 579,000 $ 768,000
Domestic Tax Authority [Member]    
Open Tax Year 2018 2019 2020 2021  
Foreign Tax Authority [Member]    
Open Tax Year 2014 2015 2016 2017 2018 2019 2020 2021