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Note 14 - Share Capital - Common Shares Outstanding (Details) - shares | 12 Months Ended
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Jan. 31, 2017 | Jan. 31, 2016 | Jan. 31, 2015
Balance, beginning of year (in shares) | 75,761,184 | 75,480,000 | 63,661,000
Stock options and share units exercised (in shares) | 114,000 | 281,000 | 478,000
Acquisitions (Note 3) (in shares) |  |  | 416,000
Balance, end of year (in shares) | 75,874,684 | 75,761,184 | 75,480,000
Public Offering [Member] |  |  |
Issuance of common shares (in shares) |  |  | 10,925,000

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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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