Note 12 - Earnings Per Share - Reconciliation of Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Aug. 25, 2018	Aug. 26, 2017	Aug. 25, 2018	Aug. 26, 2017
Basic earnings (loss) per share, net income (loss)	$ 2,945	$ 4,579	$ 6,321	$ 13,282
Basic earnings (loss) per share, weighted average shares (in shares)	10,666,529	10,661,433	10,684,720	10,641,035
Basic earnings per share (in dollars per share)	$ 0.28	$ 0.43	$ 0.59	$ 1.25
Options and restricted shares, weighted average shares (in shares)	33,188	69,772	46,632	81,558
Options and restricted shares, net income per share (in dollars per share)				$ (0.01)
Diluted earnings (loss) per share, net income (loss)	$ 2,945	$ 4,579	$ 6,321	$ 13,282
Diluted earnings (loss) per share, weighted average shares (in shares)	10,699,717	10,731,205	10,731,352	10,722,593
Diluted earnings per share (in dollars per share)	$ 0.28	$ 0.43	$ 0.59	$ 1.24