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Note R - Segment and Geographic Information (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Revenue from External Customers by Geographic Areas [Table Text Block]
   

Year ended December 31,

 
   

2021

   

2020

   

2019

 

Revenues:

                       

United States

  $ 14,633     $ 18,380     $ 9,795  

Taiwan

    99,201       131,076       97,776  

China

    97,731       85,167       83,301  
    $ 211,565     $ 234,623     $ 190,872  
Long-lived Assets by Geographic Areas [Table Text Block]
   

As of December 31,

 
   

2021

   

2020

   

2019

 

Long-lived assets:

                       

United States

  $ 87,709     $ 90,999     $ 94,507  

Taiwan

    63,644       71,080       73,816  

China

    108,509       108,575       97,687  
    $ 259,862     $ 270,654     $ 266,010