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Capital stock (Tables)
 12 Months Ended
Dec. 29, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
       Weighted-  
       average  
     Weighted-remaining  
     averagecontractualAggregate
    Optionsexercise priceterm (years)intrinsic value
Outstanding at beginning of year 2,656,060$ 5.51   
Granted 1,375,500  5.56   
Exercised (99,760)  2.42   
Forfeited or expired (244,300)  7.89   
Outstanding at end of year 3,687,500$ 5.46 4.5$ 3,036
Exercisable at end of year 1,028,740$ 5.55 3.0$ 1,414
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
    December 29, 2012December 31, 2011January 1, 2011
Dividend yield(1)0%0%0%
Expected volatility(2)65.8%68.0%68.2%
Risk-free interest rate(3)1.2%1.8%2.3%
Expected life of options (years)(4) 6.5 6.0 6.0

(1)       Determined based on expected annual dividend yield at the time of grant.

(2)       Determined based on historical volatility of the Company's common shares over the expected life of the option.

(3)       Determined based on the yield on U.S. Treasury zero-coupon issues with maturity dates equal to the expected life of the option.

(4)       For the year ended December 29, 2012, determined using simplified method, as the Company changed the term of its stock option grants from six years to 10 years and, as a result, historical exercise data may no longer provide a reasonable basis upon which to estimate expected life. For the years ended December 31, 2011 and January 1, 2011, determined based on historical exercise and forfeiture patterns.

 
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding [Table Text Block]
      Vested Weighted-TotalWeighted-
 Exercise price rangeoutstanding average priceoutstandingaverage price
Expiry date Low  Highoptions (vested)options (total)
2013$ 12.31 $ 13.75 155,500$ 12.57 155,500$ 12.57
2014  4.06   13.35 228,800  5.59 292,100  5.59
2015  0.91   1.92 297,940  1.65 564,900  1.66
2016  4.45   5.62 182,900  4.49 485,000  4.49
2017  4.88   7.72 163,600  7.07 818,000  7.07
2022  5.14   5.73 -  - 1,372,000  5.56
       1,028,740$ 5.55 3,687,500$ 5.46