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Intangible assets
 12 Months Ended
Dec. 31, 2016
Intangible assets [Abstract]  
Intangible assets
6. Intangible assets
 
Identifiable intangible assets are recorded in Intangible assets in the accompanying Consolidated Balance Sheets and are comprised of the following:

 
 
December 31,
 
 
 
2016
  
2015
 
 
(In thousands)
 
Gross Amount
  
Accumulated Amortization
  
Gross Amount
  
Accumulated Amortization
 
Purchased technology
 
$
1,604
  
$
(1,433
)
 
$
1,604
  
$
(1,357
)
Customer relationships
  
1,300
   
(1,163
)
  
1,300
   
(946
)
Trademark
  
480
   
(257
)
  
480
   
(210
)
Covenant not to compete
  
146
   
(146
)
  
146
   
(146
)
Patents
  
57
   
(43
)
  
57
   
(40
)
Other
  
80
   
(80
)
  
80
   
(80
)
Total
 
$
3,667
  
$
(3,122
)
 
$
3,667
  
$
(2,779
)

 
Amortization expense was $343,000, $454,000 and $515,000 in 2016, 2015 and 2014, respectively.  Amortization expense for each of the next five years ending December 31 is expected to be as follows: $236,000 in 2017; $98,000 in 2018; $98,000 in 2019; $82,000 in 2020; $31,000 in 2021 and $0 in 2022.