Note 12 - Earnings (Loss) Per Share - Reconciliation of Basic and Diluted Loss Per Share (Details) - USD ($)	3 Months Ended			9 Months Ended
	Aug. 29, 2020		Aug. 31, 2019	Aug. 29, 2020		Aug. 31, 2019
Basic earnings per share, net income	$ 2,178,000		$ 2,157,000	$ (16,964,000)		$ 3,210
Basic earnings per share, weighted average shares (in shares)	9,955,382		10,212,259	9,979,861		10,368,891
Basic earnings (loss) per share (in dollars per share)	$ 0.22		$ 0.21	$ (1.70)		$ 0.31
Options and restricted shares, net income	$ 0	[1]	$ 0	$ 0	[1]	$ 0
Options and restricted shares, weighted average shares (in shares)	16,263	[1]	28,276	0	[1]	26,914
Diluted earnings per share, net income	$ 2,178,000		$ 2,157,000	$ (16,964,000)		$ 3,210
Diluted earnings per share, weighted average shares (in shares)	9,971,645		10,240,535	9,979,861		10,395,805
Diluted earnings (loss) per share (in dollars per share)	$ 0.22		$ 0.21	$ (1.70)		$ 0.31

[1] Due to the net loss, the potentially dilutive securities would have been anti-dilutive and are therefore excluded.