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Components of Deferred Tax Assets (Liabilities) (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets    
Inventory $ 1,112us-gaap_DeferredTaxAssetsInventory $ 1,155us-gaap_DeferredTaxAssetsInventory
Bad debt provision 47us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 60us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Property and equipment 81us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 95us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Deferred credits 1,280us-gaap_DeferredTaxAssetsDeferredIncome 1,280us-gaap_DeferredTaxAssetsDeferredIncome
Loss carryforwards 1,203us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 1,031us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Rent 121us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent 148us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent
Other 802us-gaap_DeferredTaxAssetsOther 812us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets 4,646us-gaap_DeferredTaxAssetsGross 4,581us-gaap_DeferredTaxAssetsGross
Less valuation allowance (1,354)us-gaap_DeferredTaxAssetsValuationAllowance [1] (1,369)us-gaap_DeferredTaxAssetsValuationAllowance [1]
Deferred Tax Assets, Net of Valuation Allowance, Total 3,292us-gaap_DeferredTaxAssetsNet 3,212us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities    
Property and equipment (79)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (84)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Unremitted earnings of foreign affiliates (29)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings (53)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
Gross deferred tax liabilities (108)us-gaap_DeferredTaxLiabilities (137)us-gaap_DeferredTaxLiabilities
Net deferred tax assets $ 3,184us-gaap_DeferredTaxAssetsLiabilitiesNet [2] $ 3,075us-gaap_DeferredTaxAssetsLiabilitiesNet [2]
[1] The deferred tax valuation allowance decreased by $15,000 during 2014 and $7,000 during 2013.
[2] $1,755,000 and $1,849,000 of the total deferred tax assets at December 31, 2014 and 2013 were included in current assets and $1,429,000 and $1,226,000 were included in other long-term assets at December 31, 2014 and 2013, respectively.