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Note 6 - Revenue From Contracts with Customers
 6 Months Ended
Jun. 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
six
months ended
June 30, 2018
are as follows:
 
Balance - January 1, 2018
   $
213
  
Bad debt expense
    
50
  
Write-offs
    
(30
)
Balance - June 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
June 30,
    
Six Months Ended
June 30,
 
   
2018
    
2017
    
2018
   
2017
 
Net revenues by customer type:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
End user
   $
18,173
     $
15,029
     $
34,502
     $
27,515
  
OEM/Integrator
    
2,924
      
859
      
5,466
      
2,553
  
    $
21,097
     $
15,888
     $
39,968
     $
30,068
  
                                 
Net revenues by product type:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Thermal test
   $
6,389
     $
6,312
     $
12,420
     $
13,134
  
Induction heating
    
5,937
      
1,725
      
11,559
      
1,725
  
Semiconductor production test
    
6,809
      
6,053
      
12,148
      
12,216
  
Service/other
    
1,962
      
1,798
      
3,841
      
2,993
  
    $
21,097
     $
15,888
     $
39,968
     $
30,068
  
                                 
Net revenues by market:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Semiconductor
   $
13,043
     $
10,155
     $
23,582
     $
20,594
  
Industrial
    
5,000
      
2,178
      
10,653
      
2,298
  
Telecommunications
    
1,343
      
2,196
      
2,622
      
4,891
  
Other non-semiconductor markets
    
1,711
      
1,359
      
3,111
      
2,285
  
    $
21,097
     $
15,888
     $
39,968
     $
30,068