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Income Taxes - Components of Deferred Federal Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets, current:    
Accrued liabilities $ 161us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities $ 413us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Allowance for doubtful accounts 111us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 120us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Inventory 122us-gaap_DeferredTaxAssetsInventory 270us-gaap_DeferredTaxAssetsInventory
Long-term contracts 0us-gaap_DeferredTaxAssetsDeferredIncome 149us-gaap_DeferredTaxAssetsDeferredIncome
Valuation allowance, current 0us-gaap_DeferredTaxAssetsValuationAllowanceCurrent 0us-gaap_DeferredTaxAssetsValuationAllowanceCurrent
Deferred tax assets, current 394us-gaap_DeferredTaxAssetsNetCurrent 952us-gaap_DeferredTaxAssetsNetCurrent
Deferred tax liabilities, current 0us-gaap_DeferredTaxLiabilities 0us-gaap_DeferredTaxLiabilities
Net deferred tax assets (liabilities), current 394us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 952us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Deferred tax assets, noncurrent:    
Deferred compensation 726us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 686us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Net operating loss 3,848us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 2,909us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Intangible assets 0us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 86us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Foreign tax credit carry forward 2,811us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 1,153us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
Valuation allowance, noncurrent (7,845)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent (5,385)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent
Deferred tax assets, noncurrent (460)us-gaap_DeferredTaxAssetsNetNoncurrent (551)us-gaap_DeferredTaxAssetsNetNoncurrent
Deferred tax liabilities, noncurrent:    
Equity in foreign investments (2,900)us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates (3,233)us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates
Property and equipment 66us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (147)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Intangible assets 0us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (9)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Translation gain (523)us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains (553)us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains
Deferred tax liabilities, noncurrent (3,357)us-gaap_DeferredTaxLiabilitiesGrossNoncurrent (3,942)us-gaap_DeferredTaxLiabilitiesGrossNoncurrent
Net deferred tax assets (liabilities), noncurrent $ (3,817)us-gaap_DeferredTaxLiabilitiesNoncurrent $ (4,493)us-gaap_DeferredTaxLiabilitiesNoncurrent