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Note 15 - Segment Information (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
  

Three Months Ended
March 31,

 
  

2022

  

2021

 

Revenue:

        

Electronic Test

 $8,778  $8,501 

Environmental Technologies

  6,993   6,198 

Process Technologies

  8,310   4,857 

Total revenue

 $24,081  $19,556 
         

Income from divisional operations:

        

Electronic Test

 $1,887  $2,987 

Environmental Technologies

  802   923 

Process Technologies

  730   456 

Total income from divisional operations

  3,419   4,366 

Corporate expenses

  (1,835

)

  (1,482

)

Acquired intangible amortization

  (782

)

  (304

)

Other income (expense)

  (147

)

  (2

)

Earnings before income tax expense

 $655  $2,578 
Revenue from External Customers by Geographic Areas [Table Text Block]
  

Three Months Ended
March 31,

 
  

2022

  

2021

 

Revenue:

        

U.S.

 $9,234  $5,747 

Foreign

  14,847   13,809 
  $24,081  $19,556 
Long-Lived Assets by Geographic Areas [Table Text Block]
  

March 31,

  

December 31,

 
  

2022

  

2021

 

Property and equipment:

        

U.S.

 $2,433  $2,346 

Foreign

  371   342 
  $2,804  $2,688 
Asset [Member]  
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
  

March 31,

  

December 31,

 
  

2022

  

2021

 

Identifiable assets:

        

Electronic Test

 $28,319  $26,251 

Environmental Technologies

  15,736   15,411 

Process Technologies

  51,737   52,120 

Corporate

  7,142   10,123 
  $102,934  $103,905