Note 11 - Earnings Per Share - Reconciliation of Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Feb. 27, 2021	Feb. 29, 2020
Basic earnings per share, net income	$ 4,011	$ 1,210
Basic earnings per share, weighted average shares (in shares)	9,919,518	10,027,227
Basic earnings per share (in dollars per share)	$ 0.40	$ 0.12
Options and restricted shares, net income	$ 0	$ 0
Options and restricted shares, weighted average shares (in shares)	20,287	25,969
Diluted earnings per share, net income	$ 4,011	$ 1,210
Diluted earnings per share, weighted average shares (in shares)	9,939,805	10,053,196
Diluted earnings per share (in dollars per share)	$ 0.40	$ 0.12