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Note 6 - Revenue From Contracts With Customers
 9 Months Ended
Sep. 30, 2018
Notes to Financial Statements  
Revenue from Contract with Customer [Text Block]
(
6
)
REVENUE FROM CONTRACTS WITH CUSTOMERS
 
Changes in the amount of the allowance for doubtful accounts for the
nine
months ended
September 30, 2018
are as follows:
 
Balance - January 1, 2018
   $
213
  
Bad debt expense
    
50
  
Write-offs
    
(30
)
Balance - September 30, 2018
   $
233
  
 
The following tables provide additional information about our revenue from contracts with customers, including revenue by customer and product type and revenue by market. See also Note
12
for information about revenue by operating segment and geographic region.
 
   
Three Months Ended

September
30,
    
Nine
Months Ended

September
30,
 
   
2018
    
2017
    
2018
   
2017
 
Net revenues by customer type:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
End user
   $
17,186
     $
15,877
     $
51,687
     $
43,392
  
OEM/Integrator
    
2,974
      
1,475
      
8,441
      
4,028
  
    $
20,160
     $
17,352
     $
60,128
     $
47,420
  
Net revenues by product type:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Thermal test
   $
6,544
     $
5,418
     $
18,964
     $
18,552
  
Induction heating
    
6,150
      
4,341
      
17,709
      
6,067
  
Semiconductor production test
    
5,245
      
5,383
      
17,393
      
17,598
  
Service/other
    
2,221
      
2,210
      
6,062
      
5,203
  
    $
20,160
     $
17,352
     $
60,128
     $
47,420
  
Net revenues by market:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Semiconductor
   $
11,415
     $
9,162
     $
34,997
     $
29,756
  
Industrial
    
5,576
      
5,232
      
16,229
      
7,530
  
Telecommunications
    
2,051
      
1,661
      
4,673
      
6,552
  
Other non-semiconductor markets
    
1,118
      
1,297
      
4,229
      
3,582
  
    $
20,160
     $
17,352
     $
60,128
     $
47,420