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Note 10 - Income Tax (Details Textual) - USD ($)
Pure in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2023
Unrecognized Tax Benefits $ 3,889 $ 0 $ 0 $ 1,915
Unrecognized Tax Benefits that Would Impact Effective Tax Rate $ 2,000      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 0.00% 0.00% 0.00%  
Operating Loss Carryforwards $ 13,300 $ 20,900    
Open Tax Year 2017 2018 2019 2020 2021 2022