Sources of Temporary Differences and Carry Forwards, and Their Effect on Net Deferred Tax Asset (Detail) - USD ($) $ in Thousands	Feb. 29, 2020	Feb. 28, 2019
Current deferred tax assets(liabilities):
Uniform capitalization costs	$ 101	$ 85
Foreign tax credit carry-forward	73	99
Inventory reserves	191	211
Accrued liabilities	44	44
Allowance for doubtful accounts	2	4
Other	(9)	(10)
Non-current deferred tax assets:
Federal net operating loss carry-forward	3,130	2,883
Non-deductible losses	1,365	1,360
State net operating loss carry-forward	808	717
Amortization of intangibles	1	2
Foreign tax credit carry-forward	319	318
Basis difference of property, plant and equipment	39	43
Valuation allowance	(6,064)	(5,756)
Net deferred tax assets	$ 0	$ 0