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Note 11 - Segment Information and Foreign Operations (Tables)
6 Months Ended
Jun. 30, 2025
Notes Tables  
Revenue from External Customers by Products and Services [Table Text Block]
  

Three Months Ended

  

Six Months Ended

 
  

June 30,

  

June 30,

 
  

2025

  

2024

  

2025

  

2024

 

Product Type:

                

Substrates

 $11,292  $19,745  $22,374  $36,648 

Raw Materials and Other

  6,682   8,178   14,956   13,963 

Total

 $17,974  $27,923  $37,330  $50,611 
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
  

Three Months Ended

  

Six Months Ended

 
  

June 30,

  

June 30,

 
  

2025

  

2024

  

2025

  

2024

 

Geographical region:

                

China

 $14,492  $16,947  $27,918  $28,464 

Taiwan

  530   3,420   1,751   8,002 

Japan

  704   796   1,422   1,786 

Asia Pacific (excluding China, Taiwan and Japan)

  427   712   1,208   1,510 

Europe (primarily Germany)

  1,597   4,689   3,698   8,414 

North America (primarily the United States)

  224   1,359   1,333   2,435 

Total

 $17,974  $27,923  $37,330  $50,611 
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]
  

As of

 
  

June 30,

  

December 31,

 
  

2025

  

2024

 

Long-lived assets by geographic region, net of depreciation:

        

North America

 $1,208  $1,353 

China

  160,739   160,847 
  $161,947  $162,200