Note 9 - Accounting for Share-based Compensation - Nonvested Restricted Stock Activity (Details) - $ / shares	12 Months Ended
Nov. 30, 2019	Dec. 01, 2018	Dec. 02, 2017	Nov. 28, 2015
Nonvested (in shares)	414,353	462,241	389,697
Nonvested (in dollars per share)	$ 47.45	$ 44.80	$ 38.36
Nonvested (Year)	9 months 18 days	1 year	1 year	1 year
Granted (in shares)	302,132	165,909	287,684
Granted (in dollars per share)	$ 44.29	$ 45.92	$ 50.05
Granted (Year)	2 years 2 months 12 days	2 years 2 months 12 days	1 year 2 months 12 days
Vested (in shares)	(197,349)	(209,137)	(193,105)
Vested (in dollars per share)	$ 45.45	$ 40.38	$ 39.92
Forfeited (in shares)	(31,139)	(4,660)	(22,035)
Forfeited (in dollars per share)	$ 43.37	$ 47.27	$ 39.67
Forfeited (Year)	4 months 24 days	1 year 1 month 6 days	1 year 1 month 6 days
Nonvested (in shares)	487,997	414,353	462,241
Nonvested (in dollars per share)	$ 46.56	$ 47.45	$ 44.80
Restricted Stock Units (RSUs) [Member]
Nonvested (in shares)	414,353	462,241	352,744
Granted (in shares)	302,132	165,909	287,684
Vested (in shares)	(197,349)	(209,137)	(156,152)
Forfeited (in shares)	(31,139)	(4,660)	(22,035)
Nonvested (in shares)	487,997	414,353	462,241
Restricted Stock [Member]
Nonvested (in shares)	0	0	36,953
Granted (in shares)	0	0	0
Vested (in shares)	0	0	(36,953)
Forfeited (in shares)	0	0	0
Nonvested (in shares)	0	0	0

Weighted average contractual life for awards other than options forfeited during the period.

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Weighted average contractual life for awards other than options granted during the period.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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).

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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).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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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.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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