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Significant accounting policies Net loss per common share (Tables)
 12 Months Ended
Jan. 31, 2018
Basic weighted average number of common shares outstanding [Line Items]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Basic weighted average number of common shares outstanding (in thousands)
2017

2016

Basic weighted average number of common shares outstanding
7,680

7,488

Dilutive effect of stock options, deferred stock and restricted stock units
—

—

Weighted average number of common shares outstanding assuming full dilution
7,680

7,488

 
 
 
Stock options not included in the computation of diluted EPS of common stock because the option exercise prices exceeded the average market prices
139

306

Canceled options during the year
(131
)
(159
)
Stock options with an exercise price below the average stock price
219

218