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Note 8 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%      
Income Tax Expense (Benefit), Total $ 3,570 $ (0) $ (0)  
Current Income Tax Expense (Benefit), Total 3,570 0 0  
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries 48      
Undistributed Earnings of Foreign Subsidiaries 161      
Unrecognized Tax Benefits, Ending Balance 1,065 730 956 $ 624
Deferred Tax Assets, Unrecognized Tax Benefit 427 244    
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 638 486    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total 0 0 $ 0  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total $ 203 $ 203    
Foreign Tax Authority [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 2018 2019 2020 2021      
Foreign Tax Authority [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 Authority [Member] | State Administration of Taxation, China [Member]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent, Foreign 25.00%      
Operating Loss Carryforwards, Total $ 224      
Operating Loss Carryforwards, Term (Year) 5 years      
Operating Loss Carryforwards, Subject to Expiration $ 224      
Open Tax Year 2016 2017 2018 2019 2020 2021      
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]        
Operating Loss Carryforwards, Total $ 23,986      
Operating Loss Carryforwards, Term (Year) 20 years      
Open Tax Year 2018 2019 2020 2021      
State and Local Jurisdiction [Member]        
Open Tax Year 2018 2019 2020 2021