Sources of Temporary Differences and Carry Forwards, and Their Effect on Net Deferred Tax Asset (Detail) - USD ($) $ in Thousands	Feb. 28, 2018	Feb. 28, 2017
Current deferred tax assets(liabilities):
Uniform capitalization costs	$ 85	$ 88
Inventory reserves	211	336
Accrued liabilities	44	70
Allowance for doubtful accounts	4	5
Other	(10)	(1)
Valuation allowance	(334)	(498)
Net current deferred tax assets	0	0
Non-current deferred tax assets:
Amortization of intangibles	2	19
Deferred rent	0	14
Non-deductible losses	1,360	1,373
State net operating loss carry-forward	717	732
Federal net operating loss carry-forward	2,883	2,733
Federal tax credit carry forward	318	318
Foreign tax credit carry-forward	99	99
Basis difference of property, plant and equipment	43	33
Valuation allowance	(5,422)	(5,321)
Net non-current deferred tax assets	0	0
Net deferred tax assets	$ 0	$ 0