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Shareholders' equity (Tables)
 6 Months Ended
Jun. 30, 2018
Shareholders' equity [Abstract]  
Changes in shareholders' equity
Changes in shareholders' equity for the six months ended June 30, 2018 were as follows (in thousands):

Balance at December 31, 2017
 
$
26,014
 
Net income
  
1,890
 
Share-based compensation expense
  
337
 
Issuance of shares from exercise of stock options
  
108
 
Foreign currency translation adjustment
  
(11
)
Relinquishment of stock awards upon exercise and fully vested deferred stock units
  
(265
)
Dividends declared and paid on common stock
  
(1,336
)
Purchase of common stock for treasury
  
(2,000
)
Balance at June 30, 2018
 
$
24,737