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4. Earnings per share (Tables)
6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
   
Six Months Ended
   
June 30,
   
June 30,
   
2016
   
2015
   
2016
   
2015
   
(In thousands, except per share data)
                       
Net income
  $ 753     $ 1,388     $ 1,378     $ 1,532
                               
Shares:
                             
Basic:  Weighted average common shares outstanding
    7,689       7,798       7,761       7,827
Add:  Dilutive effect of outstanding options as determined by the
        treasury stock method
    54       21       52       20
Diluted:  Weighted average common and common equivalent shares
outstanding
    7,743       7,819       7,813       7,847
                               
Net income per common share:
                             
Basic
  $ 0.10     $ 0.18     $ 0.18     $ 0.20
Diluted
  $ 0.10     $ 0.18     $ 0.18     $ 0.20