Supplemental Cash Flow Information (Detail 1) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Feb. 28, 2022	Nov. 30, 2021	Aug. 31, 2021	May 31, 2021	Feb. 28, 2021	Nov. 30, 2020	Aug. 31, 2020	May 31, 2020	Feb. 28, 2022	Feb. 28, 2021
Selected Quarterly Financial Data [Line Items]
Net sales	$ 1,624	$ 1,616	$ 1,904	$ 1,857	$ 3,683	$ 2,861	$ 2,292	$ 3,705	$ 7,001	$ 12,541
Gross profit	(186)	(555)	51	367	505	948	185	978	(323)	2,616
Net income (loss)	$ (1,173)	$ (806)	$ 164	$ (745)	$ (60)	$ 1,880	$ (1,001)	$ (8)	$ (2,560)	$ 812
Basic net income (loss) per share	$ (0.2)	$ (0.14)	$ 0.03	$ (0.13)	$ (0.01)	$ 0.32	$ (0.17)	$ 0	$ (0.44)	$ 0.14
Diluted net income (loss) per share	$ (0.2)	$ (0.14)	$ 0.03	$ (0.13)	$ (0.01)	$ 0.31	$ (0.17)	$ 0	$ (0.44)	$ 0.13