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. 26, 2017	Aug. 27, 2016	Aug. 26, 2017	Aug. 27, 2016
Diluted earnings per share, Weighted Average Shares (in shares)	10,731,205	10,878,667	10,722,593	10,901,940
Diluted earnings per share (in dollars per share)	$ 0.43	$ 0.38	$ 1.24	$ 0.99
Basic earnings per share, Net Income	$ 4,579	$ 4,165	$ 13,282	$ 10,784
Basic earnings per share, Weighted Average Shares (in shares)	10,661,433	10,739,006	10,641,035	10,762,106
Basic earnings per share (in dollars per share)	$ 0.43	$ 0.39	$ 1.25	$ 1
Options and restricted shares, Weighted Average Shares (in shares)	69,772	139,661	81,558	139,834
Options and restricted shares, Net Income Per Share (in dollars per share)			$ (0.01)
Diluted earnings per share, Net Income	$ 4,579	$ 4,165	$ 13,282	$ 10,784