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Income Taxes (Details 2) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Current Deferred Tax Assets:    
Accrued expenses $ 68,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities $ 134,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Allowance for doubtful accounts 32,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 6,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Inventory reserve 13,000us-gaap_DeferredTaxAssetsInventory 14,000us-gaap_DeferredTaxAssetsInventory
Net operating loss carryforwards 3,000isig_CurrentDeferredTaxAssetsOperatingLossCarryforwards 16,000isig_CurrentDeferredTaxAssetsOperatingLossCarryforwards
Prepaid expenses (71,000)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses  
Other 7,000us-gaap_DeferredTaxAssetsOther 1,000us-gaap_DeferredTaxAssetsOther
Current deferred tax assets 52,000us-gaap_DeferredTaxAssetsNetCurrent 171,000us-gaap_DeferredTaxAssetsNetCurrent
Long-Term Deferred Tax Assets (Liabilities):    
Depreciation (324,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (372,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Stock options 73,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 68,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Net operating loss carryforwards 29,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 20,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Long-term deferred tax liabilities $ (222,000)us-gaap_DeferredTaxLiabilitiesNoncurrent $ (284,000)us-gaap_DeferredTaxLiabilitiesNoncurrent