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Note 7 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%        
Income Tax Expense (Benefit), Total $ 106 $ 163 $ 3,570    
Deferred Tax Liabilities, Undistributed Foreign Earnings 0        
Unrecognized Tax Benefits 3,194 3,634 1,065 $ 730  
Deferred Tax Assets, Unrecognized Tax Benefit 1,348 1,391      
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 1,846 2,243      
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total 523 315 $ 0    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued $ 1,041 $ 518      
Foreign Tax Jurisdiction [Member] | Australian Taxation Office [Member]          
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent, Foreign 30.00%        
Income Tax Expense (Benefit), Total $ 0        
Open Tax Year 2020 2021 2022 2023        
Foreign Tax Jurisdiction [Member] | Inland Revenue, Hong Kong [Member]          
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent, Foreign 16.50%        
Income Tax Expense (Benefit), Total $ 0        
Foreign Tax Jurisdiction [Member] | State Administration of Taxation, China [Member]          
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent, Foreign 25.00%        
Effective Income Tax Rate Reconciliation, at Preferential Income Tax Rate, Percent, Foreign 15.00%        
Effective Income Tax Rate Reconciliation, at Preferential Income Tax Rate, Duration, Foreign (Year) 3 years        
Operating Loss Carryforwards $ 11,721        
Operating Loss Carryforwards, Term (Year) 10 years        
Operating Loss Carryforwards, Subject to Expiration $ 11,748        
Open Tax Year 2018 2019 2020 2021 2022 2023        
Domestic Tax Jurisdiction [Member] | Internal Revenue Service (IRS) [Member]          
Operating Loss Carryforwards $ 122,818       $ 18,347
Operating Loss Carryforwards, Term (Year) 20 years        
Open Tax Year 2020 2021 2022 2023