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Note 4 - Accounts Receivable, Net (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Schedule of Accounts Receivable [Table Text Block]
  

June 30,

2022

  

December 31,

2021

 
  

US$(000)

  

US$(000)

 
  

(Unaudited)

     
         

Accounts receivable

  5,692   5,675 

Allowance for doubtful accounts

  (2,454)  (2,236)

Accounts receivable, net

  3,238   3,439