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Note 14 - Share Capital (Details Textual) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Apr. 18, 2016 | Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016
Proceeds from Stock Options Exercised |  | $ 1.0 | $ 0.6 | $ 0.2
Shelf Prospectus [Member] |  |  |  |
Shelf Prospectus Period | 2 years 30 days |  |  |
Shelf Prospectus, Maximum Amount | $ 500.0 |  |  |

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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + Details
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