Sources of Temporary Differences and Carry Forwards, and Their Effect on Net Deferred Tax Asset (Detail) - USD ($) $ in Thousands	Feb. 28, 2021	Feb. 29, 2020
Current deferred tax assets(liabilities):
Uniform capitalization costs	$ 112	$ 101
Foreign tax credit carry-forward	73	73
Inventory reserves	192	191
Accrued liabilities	50	44
Basis of disposal	(170)	0
Right of use assets	(271)	0
Lease liabilities	278	0
Allowance for doubtful accounts	3	2
Other	(5)	(9)
Non-current deferred tax assets:
Federal net operating loss carry-forward	3,501	3,130
Non-deductible losses	0	1,365
State net operating loss carry-forward	871	808
Amortization of intangibles	24	1
Federal tax credit carry forward	319	319
Basis difference of property, plant and equipment	3	39
Valuation allowance	(4,974)	(6,064)
Net deferred tax assets	$ 0	$ 0

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from inventory.

Name:	us-gaap_DeferredTaxAssetsInventory
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319