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Note 3 - Business Combinations - Acquisitions (Details) - USD ($) $ in Thousands	Nov. 28, 2020	Nov. 30, 2019	Nov. 24, 2018	Dec. 21, 2017
Goodwill	$ 12,146	$ 14,117	$ 16,043
Acquisition of Lane Venture [Member]
Accounts receivable, net of reserve (Note 5)				$ 1,507
Inventory, net of reserve (Note 6)				3,718
Prepaid expenses and other current assets				37
Intangible assets				7,360
Total identifiable assets acquired				12,622
Accounts payable				(357)
Other accrued liabilities				(852)
Total liabilities assumed				(1,209)
Net identifiable assets acquired				11,413
Goodwill				4,143
Total net assets acquired				$ 15,556