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Note 10 - Income Taxes (Details Textual) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00%
Foreign Tax Authority [Member]    
Income Tax Examination, Year under Examination   2015 2016 2017 2018
Income Tax Examination, Penalties and Interest Expense, Total   $ 2
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   $ (3)