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17. Quarterly results of operations (unaudited)
12 Months Ended
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information [Text Block]
17. Quarterly results of operations (unaudited)

Our quarterly results of operations for 2013 and 2012 are as follows:

   
Quarter Ended
 
(In thousands, except per share amounts)
 
March 31
   
June 30
   
September 30
   
December 31
 
2013:
                       
Net sales
  $ 15,057     $ 15,788     $ 16,768     $ 12,528  
Gross profit
    6,433       6,452       7,206       5,001  
Net income
    1,160       1,215       1,451       1,109  
Net income per share:
                               
Basic
    0.13       0.14       0.17       0.13  
Diluted
    0.13       0.14       0.17       0.13  

2012:
                       
Net sales
  $ 17,559     $ 15,853     $ 15,358     $ 19,616  
Gross profit
    6,778       5,842       5,679       7,683  
Net income
    1,208       508       23       1,882  
Net income per share:
                               
Basic
    0.13       0.06       0.00       0.21  
Diluted
    0.13       0.06       0.00       0.21