Note 7 - Earnings Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Feb. 25, 2018	Nov. 26, 2017	Aug. 27, 2017	May 28, 2017	Feb. 26, 2017	Nov. 27, 2016	Aug. 28, 2016	May 29, 2016	Feb. 25, 2018	Feb. 26, 2017	Feb. 28, 2016
Net earnings	$ 17,965	$ 716	$ 520	$ 1,394	$ 2,477	$ 1,875	$ 1,981	$ 2,950	$ 20,595	$ 9,283	$ 18,029
Weighted average common shares outstanding for basic EPS (in shares)	20,238	20,237	20,236	20,235	20,235	20,235	20,235	20,235	20,237	20,235	20,347
Net effect of dilutive options (in shares)									30	4	5
Weighted average shares outstanding for diluted EPS (in shares)	20,311	20,261	20,250	20,244	20,253	20,235	20,235	20,235	20,267	20,239	20,352
Basic earnings per share (in dollars per share)	$ 0.89	$ 0.04	$ 0.03	$ 0.07	$ 0.12	$ 0.09	$ 0.10	$ 0.15	$ 1.02	$ 0.46	$ 0.89
Diluted earnings per share (in dollars per share)	$ 0.88	$ 0.04	$ 0.03	$ 0.07	$ 0.12	$ 0.09	$ 0.10	$ 0.15	$ 1.02	$ 0.46	$ 0.89