Note 8 - Bank Credit Facility (Details Textual) - USD ($) $ in Thousands		12 Months Ended
	Jan. 27, 2022	Nov. 27, 2021	Nov. 28, 2020	Nov. 30, 2019	Feb. 28, 2022
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total		$ 322	$ 49	$ 7
Bank One [Member]
Line of Credit Facility, Maximum Borrowing Capacity		25,000
Letters of Credit Outstanding, Amount		3,931
Line of Credit Facility, Remaining Borrowing Capacity		$ 21,069
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.25%
Bank One [Member] | Forecast [Member]
Debt Instrument, Covenant, Tangible Net Worth					$ 120,000
Bank One [Member] | Subsequent Event [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 25,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.25%
Debt Instrument, Covenant, Fixed Charge Coverage Ratio	1.4
Debt Instrument, Covenant, Lease-adjusted Leverage Ratio	3.0
Debt Instrument, Covenant, Tangible Net Worth	$ 140,000
Bank One [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate		1.90%
Bank One [Member] | One-Month Term Secured Overnight Financing Rate [Member] | Subsequent Event [Member]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Bank Two [Member]
Letters of Credit Outstanding, Amount		$ 325