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Note 10 - Income Taxes (Details) - Components of Net Deferred Tax Assets and Liabilities (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2014
Current deferred tax assets:    
Accrued employee-related expenses $ 252us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits $ 298us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Allowances and reserves 346us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves 701us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves
Stock option deductible differences 388us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 301us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Inventory 252us-gaap_DeferredTaxAssetsInventory 281us-gaap_DeferredTaxAssetsInventory
Foreign tax credit mirror 285us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign  
Currency translation adjustment 144us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses  
Property, plant and equipment (1,478)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (1,434)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Goodwill and intangible assets (3,644)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets (3,453)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets
(5,122)us-gaap_DeferredTaxLiabilitiesNoncurrent (4,861)us-gaap_DeferredTaxLiabilitiesNoncurrent
1,689us-gaap_DeferredTaxAssetsNetCurrent 1,878us-gaap_DeferredTaxAssetsNetCurrent
Net deferred tax liability (3,433)us-gaap_DeferredTaxLiabilities (2,983)us-gaap_DeferredTaxLiabilities
Other Current Assets [Member]    
Current deferred tax assets:    
Net operating loss 22us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
297us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
Other Noncurrent Liabilities [Member]    
Current deferred tax assets:    
Net operating loss   $ 26us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember