Selected Quarterly Financial Data (Unaudited) - Quarterly Data (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 sales	$ 27,804	$ 26,139	$ 29,836	$ 27,417	$ 27,599	$ 26,462	$ 29,058	$ 31,490	$ 111,196	$ 114,609	$ 145,855
Gross profit	6,890	6,070	7,177	6,322	7,386	6,634	7,234	8,787	26,459	30,041	42,752
Net earnings (loss)	$ 17,965	$ 716	$ 520	$ 1,394	$ 2,477	$ 1,875	$ 1,981	$ 2,950	$ 20,595	$ 9,283	$ 18,029
Basic net 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 net 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
Basic (in shares)	20,238	20,237	20,236	20,235	20,235	20,235	20,235	20,235	20,237	20,235	20,347
Diluted (in shares)	20,311	20,261	20,250	20,244	20,253	20,235	20,235	20,235	20,267	20,239	20,352