Quarterly Consolidated Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Feb. 28, 2019	Nov. 30, 2018	Aug. 31, 2018	May 31, 2018	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	May 31, 2017	Feb. 28, 2019	Feb. 28, 2018
Selected Quarterly Financial Data [Line Items]
Net Sales	$ 3,511	$ 4,170	$ 3,321	$ 4,021	$ 3,220	$ 1,666	$ 3,161	$ 3,897	$ 15,023	$ 11,944
Gross profit	1,069	1,096	879	996	(341)	(144)	478	597	4,040	590
Net income (loss)	$ (52)	$ 71	$ (6)	$ 54	$ (1,248)	$ (1,203)	$ (221)	$ (266)	$ 67	$ (2,938)
Basic net income (loss) per share	$ (0.01)	$ 0.01	$ 0.00	$ 0.01	$ (0.21)	$ (0.20)	$ (0.04)	$ (0.05)	$ 0.01	$ (0.50)
Diluted net income (loss) per share	$ (0.01)	$ 0.01	$ 0.00	$ 0.01	$ (0.21)	$ (0.20)	$ (0.04)	$ (0.05)	$ 0.01	$ (0.50)