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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
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Current deferred tax assets: |  |
Accrued employee-related expenses | $ 252 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits | $ 298 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Allowances and reserves | 346 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves | 701 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves
Stock option deductible differences | 388 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 301 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Inventory | 252 us-gaap_DeferredTaxAssetsInventory | 281 us-gaap_DeferredTaxAssetsInventory
Foreign tax credit mirror | 285 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign |
Currency translation adjustment | 144 us-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
| 1,689 us-gaap_DeferredTaxAssetsNetCurrent | 1,878 us-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 | 22 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember | 297 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember
Other Noncurrent Liabilities [Member] |  |
Current deferred tax assets: |  |
Net operating loss |  | $ 26 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember

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