Quarterly Consolidated Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Feb. 28, 2021	Nov. 30, 2020	Aug. 31, 2020	May 31, 2020	Feb. 29, 2020	Nov. 30, 2019	Aug. 31, 2019	May 31, 2019	Feb. 28, 2021	Feb. 29, 2020
Selected Quarterly Financial Data [Line Items]
Net sales	$ 3,683	$ 2,861	$ 2,292	$ 3,705	$ 3,194	$ 1,466	$ 3,228	$ 2,709	$ 12,541	$ 10,597
Gross profit	505	948	185	978	1,189	264	499	425	2,616	2,377
Net income (loss)	$ (60)	$ 1,880	$ (1,001)	$ (8)	$ 183	$ (628)	$ (435)	$ (326)	$ 812	$ (1,206)
Basic net income (loss) per share	$ (0.01)	$ 0.32	$ (0.17)	$ 0.00	$ 0.03	$ (0.11)	$ (0.07)	$ (0.06)	$ 0.14	$ (0.21)
Diluted net income (loss) per share	$ (0.01)	$ 0.31	$ (0.17)	$ 0.00	$ 0.03	$ (0.11)	$ (0.07)	$ (0.06)	$ 0.13	$ (0.21)