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Note 4 - Revenue From Contracts With Customers (Tables)
 6 Months Ended
Jun. 30, 2019
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
Three Months Ended
June 30,
    
Six Months Ended
June 30,
 
   
2019
    
201
8
    
201
9
    
201
8
  
Net revenues by customer type:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
End user
   $
13,106
     $
18,173
     $
29,143
     $
34,502
  
OEM/Integrator
    
1,246
      
2,924
      
3,271
      
5,466
  
    $
14,352
     $
21,097
     $
32,414
     $
39,968
  
                                 
Net revenues by product type:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Thermal test
   $
4,282
     $
5,885
     $
9,249
     $
11,722
  
Induction heating
    
4,321
      
5,937
      
10,072
      
11,559
  
Semiconductor test
    
3,609
      
6,809
      
8,893
      
12,148
  
Service/other
    
2,140
      
2,466
      
4,200
      
4,539
  
    $
14,352
     $
21,097
     $
32,414
     $
39,968
  
                                 
Net revenues by market:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Semi Market
   $
7,641
     $
13,043
     $
17,752
     $
23,582
  
Industrial
    
4,279
      
5,000
      
10,225
      
10,653
  
Telecommunications
    
691
      
1,343
      
1,284
      
2,622
  
Other Multi Markets
    
1,741
      
1,711
      
3,153
      
3,111
  
    $
14,352
     $
21,097
     $
32,414
     $
39,968