Note 9 - Accounting for Share-based Compensation - Fair Value of Options Granted (Details) - $ / shares	12 Months Ended
Nov. 28, 2020	Nov. 30, 2019	Dec. 01, 2018
Maximum [Member]
Expected life (Year)	5 years	4 years 9 months	4 years 9 months
Weighted-average expected volatility	24.32%	24.26%	23.31%
Expected volatility range	30.99%	24.76%	23.58%
Risk-free interest rate	1.51%	2.55%	2.95%
Weighted-average expected dividend	1.38%	1.40%	1.14%
Expected dividend yield range	2.53%	1.45%	1.24%
Expected dividend yield range (in dollars per share)		$ 9.76	$ 11.38
Minimum [Member]
Expected volatility range	24.18%	23.88%	23.18%
Risk-free interest rate	0.21%	1.34%	2.38%
Expected dividend yield range	1.35%	1.25%	1.12%

Weighted-average dividend rate for award under share-based payment arrangement.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Rate of weighted-average expected volatility for award under share-based payment arrangement.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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 (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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