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Note 7 - Other Current Assets, Net (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Other Receivables [Table Text Block]
    As of December 31,
    2020   2019
    Gross   Allowance for doubtful accounts   Net   Gross   Allowance for doubtful accounts   Net
    US$('000)   US$('000)   US$('000)   US$('000)   US$('000)   US$('000)
                         
Staff advances for business operations    
18
      
-
      
18
      
11
      
-
      
11
  
Loan to an unrelated party    
1,444
      
-
      
1,444
      
-
      
-
      
-
  
Overdue deposits    
-
      
-
      
-
      
717
      
(717
 )    
-
  
Total    
1,462
      
-
      
1,462
      
728
      
(717
 )    
11