Note 12 - Accumulated Other Comprehensive Loss - Activity in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
Nov. 25, 2017	Nov. 26, 2016
Balance	$ 180,705	$ 177,366
Balance	191,460	180,705
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance	(2,553)	(2,678)
OCI, before Reclassifications, before Tax, Attributable to Parent		(165)
Net pension amortization reclassified from accumulated other comprehensive loss	447	366
Tax effects	20	(76)
Balance	(2,570)	$ (2,553)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]
OCI, before Reclassifications, before Tax, Attributable to Parent	(932)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
OCI, before Reclassifications, before Tax, Attributable to Parent	$ 448

Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580

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Amount of tax expense (benefit) allocated to other comprehensive income (loss) attributable to parent entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 20
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Amount before tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(30))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707

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-Name Accounting Standards Codification
-Topic 210
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