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14. Earnings per share (Tables)
12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Year Ended December 31,
   
2014
   
2013
   
2012
Net (loss) income
  $ (2,421)     $ 4,935     $ 3,621
                       
Shares:
                     
Basic:  Weighted average common shares outstanding
    8,307       8,589       9,032
Add:  Dilutive effect of outstanding options as determined by the treasury stock method
    -       114       89
Diluted:  Weighted average common and common equivalent shares outstanding
    8,307       8,703       9,121
                       
Net (loss) income per common share:
                     
Basic
  $ (0.29)     $ 0.57     $ 0.40
Diluted
    (0.29)       0.57       0.40