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Note 4 - Accounts Receivable, Net (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Accounts Receivable [Table Text Block]
    As of December 31,
    2020   2019
    US$('000)   US$('000)
         
Accounts receivable    
6,654
      
6,408
  
Allowance for doubtful accounts    
(4,247
 )    
(3,148
 )
Accounts receivable, net    
2,407
      
3,260