Note 17 - Earnings (Loss) Per Share - Reconciliation of Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended													12 Months Ended
		Nov. 28, 2020	[1]	Aug. 29, 2020	[2]	May 30, 2020	[3]	Feb. 29, 2020	Nov. 30, 2019	[4]	Aug. 31, 2019	Jun. 01, 2019	Mar. 02, 2019	[5]	Nov. 28, 2020	Nov. 30, 2019	Nov. 24, 2018
Net income (loss)		$ 6,543		$ 2,178		$ (20,352)		$ 1,210	$ (5,138)		$ 2,157	$ 445	$ 608		$ (10,421)	$ (1,928)	$ 8,218
Denominator for basic income per share - weighted average shares (in shares)															9,969,616	10,285,511	10,651,351
Effect of dilutive securities* (in shares)	[6]														0	0	40,424
Denominator for diluted income per share — weighted average shares and assumed conversions (in shares)															9,969,616	10,285,511	10,691,775
Basic income (loss) per share (in dollars per share)		$ 0.65		$ 0.22		$ (2.04)		$ 0.12	$ (0.50)		$ 0.21	$ 0.04	$ 0.06		$ (1.05)	$ (0.19)	$ 0.77
Diluted income (loss) per share (in dollars per share)		$ 0.65		$ 0.22		$ (2.04)		$ 0.12	$ (0.50)		$ 0.21	$ 0.04	$ 0.06		$ (1.05)	$ (0.19)	$ 0.77

[1] Income from operations includes a gain of $1,161 arising from the settlement of a lease obligation (see Note 14).

[2] Net income includes a non-taxable gain of $915 arising from the recognition of a death benefit from Company-owned life insurance (see Note 14).

[3] Loss from operations reflects the severe impact of the COVID-19 pandemic on our operations due to the temporary closure of substantially all of our operations during the quarter (see Note 1) and includes a goodwill impairment charge of $1,971 (see Note 8), asset impairment charges of $12,184 and a litigation expense accrual of $1,050 (see Note 14). Net loss includes the benefit of carrying back the loss to tax years with 35% federal statutory rate as provided for in the CARES Act (see Note 13).

[4] Loss from operations includes a charge for the impairment of goodwill of $1,926 (see Note 8) and charges of $4,431, $700 and $149 for impairment of long-lived assets, litigation costs and lease termination costs, respectively (see Note 14).

[5] Income from operations includes a charge of $835 arising from certain eligible employees' acceptance of voluntary early retirement package (see Note 14).

[6] Due to the net losses in 2020 and 2019, the potentially dilutive securities would have been anti-dilutive and are therefore excluded.