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17. Quarterly results of operations (unaudited)
12 Months Ended
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information [Text Block]
17. Quarterly results of operations (unaudited)

Our quarterly results of operations for 2014 and 2013 are as follows:

   
Quarter Ended
(In thousands, except per share amounts)
 
March 31
   
June 30
   
September 30
   
December 31
2014:
                     
Net sales
  $ 13,619     $ 13,804     $ 13,389     $ 12,296
Gross profit
    5,726       5,788       5,286       4,911
Net income (loss)
    394       175       50       (3,040)
Net income (loss) per share:
                             
Basic
    0.05       0.02       0.01       (0.37)
Diluted
    0.05       0.02       0.01       (0.37)

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