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Note 17 - Stock-based Compensation Plans - Summary of Restricted Share Units Activity (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2018
Vested or expected to vest, weighted-average exercise price (in dollars per share) | $ 26.82 |  |
Vested or expected to vest, weighted-average remaining contractual life (Year) | 4 years 219 days |  |
Vested or expected to vest, aggregate intrinsic value | $ 20.2 |  |
Restricted Stock Units (RSUs) [Member] |  |  |
Number of Units Outstanding (in shares) | 337,066 | 299,020 |
Weighted-Average Grant Date Fair Value, PSU (in dollars per share) | $ 14.42 | $ 12.80 |
Weighted-Average Remaining Contractual, PSU (Year) | 5 years | 5 years 219 days | 6 years 36 days
Aggregate Intrinsic Value, PSU | $ 16.8 | $ 10.6 | $ 8.1
Number of PSUs Granted (in shares) | 37,611 | 38,046 |
PSUs Granted, Weighted-Average Granted Date Fair Value (in dollars per share) | $ 38.04 | $ 27.96 |
Number of Units Outstanding (in shares) | 374,677 | 337,066 | 299,020
Weighted-Average Grant Date Fair Value, PSU (in dollars per share) | $ 16.57 | $ 14.42 | $ 12.80
Vested or expected to vest, RSU (in shares) | 374,677 |  |
Vested or expected to vest, weighted-average exercise price (in dollars per share) | $ 16.57 |  |
Vested or expected to vest, weighted-average remaining contractual life (Year) | 5 years |  |
Vested or expected to vest, aggregate intrinsic value | $ 16.8 |  |
Exercisable, number of units (in shares) | 336,921 |  |
Exercisable, PSU weighted-average granted date fair value (in dollars per share) | $ 14.56 |  |
Exercisable, Weighted-Average Remaining Contractual, PSU (Year) | 4 years 219 days |  |
Exercisable, Aggregate Intrinsic Value, PSU | $ 15.1 |  |

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- Definition The number of units exercisable other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References No definition available. + Details
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- Definition The weighted average fair value of exercisable awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for vested portions of equity instruments other than options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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