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3. Accrued product warranty liability (Tables)
3 Months Ended
Mar. 31, 2014
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability [Table Text Block]
   
(In thousands)
Balance, beginning of period
  $ 366
Warranties issued
    92
Warranty settlements
    (68)
Balance, end of period
  $ 390