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14. Earnings per share (Tables)
12 Months Ended
Dec. 31, 2013
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Year Ended December 31,
 
   
2013
   
2012
   
2011
 
Net income
  $ 4,935     $ 3,621     $ 4,676  
                         
Shares:
                       
Basic:  Weighted average common shares outstanding
    8,589       9,032       9,443  
Add:  Dilutive effect of outstanding options as determined by the treasury stock method
    114       89       160  
Diluted:  Weighted average common and common equivalent shares outstanding
    8,703       9,121       9,603  
                         
Net income per common share:
                       
Basic
  $ 0.57     $ 0.40     $ 0.50  
Diluted
    0.57       0.40       0.49