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4. Earnings per share (Tables)
9 Months Ended
Sep. 30, 2015
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
   
Nine Months Ended
   
September 30,
   
September 30,
   
2015
   
2014
   
2015
   
2014
   
(In thousands, except per share data)
                       
Net income
  $ 1,028     $ 50     $ 2,560     $ 619
                               
Shares:
                             
Basic:  Weighted average common shares outstanding
    7,800       8,337       7,818       8,362
Add:  Dilutive effect of outstanding options as determined by the
        treasury stock method
    48       66       26       125
Diluted:  Weighted average common and common equivalent shares
outstanding
    7,848       8,403       7,844       8,487
                               
Net income per common share:
                             
Basic
  $ 0.13     $ 0.01     $ 0.33     $ 0.07
Diluted
  $ 0.13     $ 0.01     $ 0.33     $ 0.07