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. 31, 2019	Aug. 25, 2018	Aug. 31, 2019	Aug. 25, 2018
Basic earnings (loss) per share, net income (loss)	$ 2,157	$ 2,945	$ 3,210	$ 6,321
Basic earnings (loss) per share, weighted average shares (in shares)	10,212,259	10,666,529	10,368,891	10,684,720
Basic earnings per share (in dollars per share)	$ 0.21	$ 0.28	$ 0.31	$ 0.59
Options and restricted shares	$ 0	$ 0	$ 0	$ 0
Options and restricted shares, weighted average shares (in shares)	28,276	33,188	26,914	46,632
Options and restricted shares, net income per share (in dollars per share)	$ 0	$ 0	$ 0	$ 0
Diluted earnings (loss) per share, net income (loss)	$ 2,157	$ 2,945	$ 3,210	$ 6,321
Diluted earnings (loss) per share, weighted average shares (in shares)	10,240,535	10,699,717	10,395,805	10,731,352
Diluted earnings per share (in dollars per share)	$ 0.21	$ 0.28	$ 0.31	$ 0.59