Note 8 - Accounting for Share-based Compensation - Nonvested Restricted Stock Activity (Details) - $ / shares	9 Months Ended	12 Months Ended
Sep. 02, 2017	Dec. 03, 2016
Nonvested at December 3, 2016 (in shares)	389,697
Nonvested at December 3, 2016 (in dollars per share)	$ 38.36
Nonvested at September 2, 2017 (in dollars per share)	$ 44.72	$ 38.36
Nonvested at December 3, 2016 (Year)	1 year 73 days	1 year
Granted (in shares)	284,598
Granted (in dollars per share)	$ 50.71
Granted (Year)	1 year 146 days
Vested (in shares)	(191,469)
Vested (in dollars per share)	$ 39.92
Forfeited (in shares)	(20,597)
Forfeited (in dollars per share)	$ 39.06
Forfeited (Year)	1 year 109 days
Nonvested at September 2, 2017 (in shares)	462,229	389,697
Restricted Stock Units (RSUs) [Member]
Nonvested at December 3, 2016 (in shares)	352,744
Granted (in shares)	284,598
Vested (in shares)	(154,516)
Forfeited (in shares)	(20,597)
Nonvested at September 2, 2017 (in shares)	462,229	352,744
Restricted Stock [Member]
Nonvested at December 3, 2016 (in shares)	36,953
Granted (in shares)
Vested (in shares)	(36,953)
Forfeited (in shares)
Nonvested at September 2, 2017 (in shares)		36,953

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.

+ References

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

+ 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)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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.

+ 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)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
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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.

+ 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)
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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
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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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-Publisher FASB
-Name Accounting Standards Codification
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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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-Publisher FASB
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