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Note 17 - Stock-based Compensation Plans - Options Outstanding and Options Exercisable (Details)	12 Months Ended
	Jan. 31, 2021 $ / shares shares
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 33.77
Number of Stock Options, Options Outstanding (in shares) | shares	1,147,720
Weighted Average Remaining Contractual Life, Options Outstanding (Year)	4 years 328 days
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 29.52
Number of Stock Options, Options Exercisable (in shares) | shares	646,065
Range 1 [Member]
Range of Exercise Prices, Lower Limit (in dollars per share)	$ 11.32
Range of Exercise Prices, Upper Limit (in dollars per share)	22.34
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 21.06
Number of Stock Options, Options Outstanding (in shares) | shares	220,559
Weighted Average Remaining Contractual Life, Options Outstanding (Year)	2 years 328 days
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 21.01
Number of Stock Options, Options Exercisable (in shares) | shares	203,459
Range 2 [Member]
Range of Exercise Prices, Lower Limit (in dollars per share)	$ 25.65
Range of Exercise Prices, Upper Limit (in dollars per share)	27.23
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 27.22
Number of Stock Options, Options Outstanding (in shares) | shares	217,381
Weighted Average Remaining Contractual Life, Options Outstanding (Year)	4 years 73 days
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 27.23
Number of Stock Options, Options Exercisable (in shares) | shares	186,707
Range 3 [Member]
Range of Exercise Prices, Lower Limit (in dollars per share)	$ 37.66
Range of Exercise Prices, Upper Limit (in dollars per share)	39.30
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 38.09
Number of Stock Options, Options Outstanding (in shares) | shares	636,869
Weighted Average Remaining Contractual Life, Options Outstanding (Year)	5 years 255 days
Weighted Average Exercise Price, Options Exercisable (in dollars per share)	$ 37.96
Number of Stock Options, Options Exercisable (in shares) | shares	255,899
Range 4 [Member]
Range of Exercise Prices, Lower Limit (in dollars per share)	$ 49.04
Range of Exercise Prices, Upper Limit (in dollars per share)	55.04
Weighted Average Exercise Price, Options Outstanding (in dollars per share)	$ 54.11
Number of Stock Options, Options Outstanding (in shares) | shares	72,911
Weighted Average Remaining Contractual Life, Options Outstanding (Year)	6 years 255 days
Weighted Average Exercise Price, Options Exercisable (in dollars per share)
Number of Stock Options, Options Exercisable (in shares) | shares

X

- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ 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 (g)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

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-Publisher FASB
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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

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- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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