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3. Accrued product warranty liability (Tables)
 6 Months Ended
Jun. 30, 2015
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability [Table Text Block] We generally warrant our products for up to 36 months

   
(In thousands)
Balance, beginning of period
  $ 287
Warranties issued
    125
Warranty settlements
    (149)
Balance, end of period
  $ 263