Note 10 - Pension and Postretirement Benefits - Sensitivity Information (Details) $ in Thousands	12 Months Ended
Dec. 02, 2017 USD ($)
Effect on service and interest cost components – annual increase	$ 82
Effect on service and interest cost components – annual decrease	(73)
Effect on accumulated postretirement benefit obligation - annual decrease	1,969
Effect on accumulated postretirement benefit obligation - annual decrease	$ (1,760)

Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (m)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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Amount of decrease in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point decrease in assumed health care cost trend rate.

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Amount of increase in accumulated postretirement benefit obligation from one-percentage-point increase in assumed health care cost trend rate.

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