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Significant accounting policies Net loss per common share (Tables) | 12 Months Ended
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Jan. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
Basic weighted average number of common shares outstanding | 2012 |  | 2011 |
Basic weighted average number of common shares outstanding | 6,922 |  | 6,878 |
Dilutive effect of stock options | — |  | — |
Weighted average number of common shares outstanding assuming full dilution | 6,922 |  | 6,878 |
Weighted average number of stock options not included in the computation of diluted EPS of common stock because the option exercise prices exceeded the average market prices | 783 |  | 653 |
Canceled options during the year | (36 | ) | (28 | )
Stock options with an exercise price below the average stock price | 186 |  | 190 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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