Note 4 - Financial Instruments and Investments (Details Textual) - USD ($) $ in Thousands	6 Months Ended
May 27, 2023	Nov. 26, 2022
Short-Term Investments	$ 17,725	$ 17,715
Certificates of Deposit, Average Term	7 months
Minimum [Member]
Interest Rate of Certificates of Deposit	0.70%
Maximum [Member]
Interest Rate of Certificates of Deposit	5.05%
Weighted Average [Member]
Interest Rate of Certificates of Deposit	4.41%
Certificates of Deposit [Member]
Short-Term Investments	$ 17,725	$ 17,715

Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(8))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(5))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(4))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

Name:	us-gaap_ShortTermInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant