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Significant accounting policies Net loss per common share (Tables) | 12 Months Ended
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Jan. 31, 2017
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 | 2016 |  | 2015 |
Basic weighted average number of common shares outstanding | 7,488 |  | 7,280 |
Dilutive effect of stock options, deferred stock and restricted stock units | — |  | 91 |
Weighted average number of common shares outstanding assuming full dilution | 7,488 |  | 7,371 |
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 | 306 |  | 710 |
Canceled options during the year | (159 | ) | (77 | )
Stock options with an exercise price below the average stock price | 218 |  | 10 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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