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Note 4 - Accounts Receivable, Net (Tables)
 9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Accounts Receivable [Table Text Block]
   
September 30,
2020
  
December 31,
2019
    US$('000)   US$('000)
    (Unaudited)    
         
Accounts receivable    
6,278
      
6,408
  
Allowance for doubtful accounts    
(3,996
 )    
(3,148
 )
Accounts receivable, net    
2,282
      
3,260