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Income Taxes - Net deferred tax asset components (Details) (USD $)
Feb. 28, 2015
Feb. 28, 2014
Income Tax Disclosure [Abstract]    
Inventory $ 127,000us-gaap_DeferredTaxAssetsInventory $ 103,000us-gaap_DeferredTaxAssetsInventory
Allowance for accounts receivable 17,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 13,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Accrued expenses and other 97,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther 59,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
Research tax credits 59,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 117,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Deferred tax asset 300,000us-gaap_DeferredTaxAssetsGross 292,000us-gaap_DeferredTaxAssetsGross
Deferred tax liability 210,000us-gaap_DeferredTaxLiabilities 202,000us-gaap_DeferredTaxLiabilities
Net deferred tax asset $ 90,000us-gaap_DeferredTaxAssetsNet $ 90,000us-gaap_DeferredTaxAssetsNet