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Income Taxes - Tax effects of temporary differences that give rise to significant portions of deferred tax assets and deferred tax liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2014
Deferred tax assets:    
Accrued expenses $ 545us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities $ 679us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Deferred stock compensation 246us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation 248us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
Net operating loss carryforward    53us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Bad debt and inventory reserves 26us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 35us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Property and equipment 23us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment   
Total deferred tax assets 840us-gaap_DeferredTaxAssetsNet 1,015us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:    
Property and equipment    (18)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Total net deferred taxes $ 840us-gaap_DeferredTaxAssetsLiabilitiesNet $ 997us-gaap_DeferredTaxAssetsLiabilitiesNet