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Note 15 - Earnings Per Share (Tables) | 12 Months Ended
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Jan. 31, 2016
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
Year Ended |  | January 31, 2016 |  |  | January 31, 2015 |  |  | January 31, 2014 |
Net income for purposes of calculating basic and diluted earnings per share |  |  | 20,562 |  |  |  | 15,059 |  |  |  | 9,612 |
Weighted average shares outstanding |  |  | 75,595 |  |  |  | 70,559 |  |  |  | 62,841 |
Dilutive effect of employee stock options |  |  | 452 |  |  |  | 665 |  |  |  | 1,258 |
Dilutive effect of restricted and performance share units |  |  | 362 |  |  |  | 360 |  |  |  | 271 |
Weighted average common and common equivalent shares outstanding |  |  | 76,409 |  |  |  | 71,584 |  |  |  | 64,370 |
Earnings per share |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 0.27 |  |  |  | 0.21 |  |  |  | 0.15 |
Diluted |  |  | 0.27 |  |  |  | 0.21 |  |  |  | 0.15 |

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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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