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Note 16 - Stock-based Compensation Plans Summary of Performance Share Units Activity (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016
Vested or expected to vest at January 31, 2018, shares (in shares) | 657,209 |  |
Vested or expected to vest at January 31, 2018, weighted-average exercise price (in dollars per share) | $ 18.21 |  |
Vested or expected to vest at January 31, 2018 (Year) | 4 years 328 days |  |
Vested or expected to vest at January 31, 2018, aggregate intrinsic value | $ 5.7 |  |
Performance Shares [Member] |  |  |
Number of Units Outstanding (in shares) | 337,647 | 253,537 |
Weighted-Average Grant Date Fair Value, PSU (in dollars per share) | $ 13.73 | $ 12.39 |
Weighted-Average Remaining Contractual, PSU (Year) | 6 years 36 days | 6 years 219 days | 7 years 73 days
Aggregate Intrinsic Value, PSU | $ 11.9 | $ 7.3 | $ 4.9
Number of PSUs Granted (in shares) | 51,121 | 54,480 |
PSUs Granted, Weighted-Average Granted Date Fair Value (in dollars per share) | $ 30.13 | $ 23.37 |
Performance units issued (in shares) | 51,752 | 29,630 |
Performance units issued, weighted-average granted date fair value (in dollars per share) | $ 14.37 | $ 9.26 |
Number of Units Outstanding (in shares) | 440,520 | 337,647 | 253,537
Weighted-Average Grant Date Fair Value, PSU (in dollars per share) | $ 15.91 | $ 13.73 | $ 12.39
Vested or expected to vest at January 31, 2018, shares (in shares) | 440,520 |  |
Vested or expected to vest at January 31, 2018, weighted-average exercise price (in dollars per share) | $ 15.91 |  |
Vested or expected to vest at January 31, 2018 (Year) | 6 years 36 days |  |
Vested or expected to vest at January 31, 2018, aggregate intrinsic value | $ 11.9 |  |
Exercisable at January 31, 2018, number of units (in shares) | 334,919 |  |
Exercisable at January 31, 2018, PSU weighted-average granted date fair value (in dollars per share) | $ 12.46 |  |
Exercisable at January 31, 2018, Weighted-Average Remaining Contractual, PSU (Year) | 5 years 109 days |  |
Exercisable at January 31, 2018, Aggregate Intrinsic Value, PSU | $ 9.0 |  |

X
- Definition Intrinsic value of equity-based compensation awards exercisable. Excludes stock and unit options. + References No definition available. + Details
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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 Represents the weighted average grant date fair value of units issued during the period. + 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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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