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5. Shareholders' equity (Tables)
9 Months Ended
Sep. 30, 2015
Stockholders' Equity Note [Abstract]  
Schedule of Stockholders Equity [Table Text Block]
Balance at December 31, 2014
  $ 25,394
Net income
    2,560
Share-based compensation expense
    377
Issuance of deferred stock units, net of relinquishments
    121
Proceeds from issuance of shares from exercise of stock options
    42
Incremental tax benefits from stock options exercised
    2
Foreign currency translation adjustment
    (4)
Dividends declared and paid on common stock
    (1,863)
Purchase of common stock for treasury
    (1,020)
Balance at September 30, 2015
  $ 25,609