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Note 9 - Related Party Note Payable (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
May 14, 2020
Feb. 27, 2019
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Pioneer Hong Kong [Member] | Promissory Note [Member]            
Debt Instrument, Face Amount   $ 1,000        
Debt Instrument, Periodic Payment, Interest $ 300 200        
Repayments of Long-term Debt, Total $ 1,000          
Debt Issuance Costs, Net, Total   $ 20        
Interest Expense, Total     $ 0 $ 0 $ 0 $ 75
China Kington [Member]            
Brokering Fee, Percent   2.00%        
Consulting Agreement, Term (Year)   1 year        
Consulting Agreement, Amount   $ 100