Note 13 - Earnings (Loss) Per Share - Reconciliation of Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 28, 2021	Aug. 29, 2020	Aug. 28, 2021	Aug. 29, 2020
Basic earnings (losses) per share	$ 3,016	$ 2,178	$ 13,001	$ (16,964)
Basic earnings (loss) per share, weighted average shares (in shares)	9,779,928	9,955,382	9,864,691	9,979,861
Basic earnings (loss) per share (in dollars per share)	$ 0.31	$ 0.22	$ 1.32	$ (1.70)
Options and restricted shares, net income	$ 0	$ 0
Options and restricted shares, weighted average shares (in shares)	5,415	16,263	9,329
Diluted earnings (loss) per share	$ 3,016	$ 2,178	$ 13,001	$ (16,964)
Diluted income (loss) per share, weighted average shares (in shares)	9,785,343	9,971,645	9,874,020	9,979,861
Diluted earnings (loss) per share (in dollars per share)	$ 0.31	$ 0.22	$ 1.32	$ (1.70)
Diluted earnings (loss) per share	$ 3,016	$ 2,178	$ 13,001	$ (16,964)
Diluted income (loss) per share (in shares)	9,785,343	9,971,645	9,874,020	9,979,861