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Note 4 - Accounts Receivable, Net (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Accounts Receivable [Table Text Block]
   
March 31,
2020
  
December 31,
2019
    US$(’000)   US$(’000)
    (Unaudited)    
         
Accounts receivable    
6,574
      
6,408
  
Allowance for doubtful accounts    
(3,504
 )    
(3,148
 )
Accounts receivable, net    
3,070
      
3,260