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Note 16 - Income Taxes (Details) - Significant Components of Company’s Deferred Tax Assets and Liabilities (USD $)
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Net operating loss carry forward, foreign $ 2,292,023us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign $ 2,578,640us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign
Stock-based compensation expense 755,044us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 1,358,554us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Accrued expenses and other 856,871us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 649,402us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Inventory reserve 333,842us-gaap_DeferredTaxAssetsInventory 283,996us-gaap_DeferredTaxAssetsInventory
Deferred revenue 23,854us-gaap_DeferredTaxAssetsDeferredIncome 852,207us-gaap_DeferredTaxAssetsDeferredIncome
Tax credit carry forward 45,621us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 19,967us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Deferred tas assets 4,307,255us-gaap_DeferredTaxAssetsGross 5,742,766us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:    
Acquisition-related Intangibles (4,826,937)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets (6,056,162)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets
Depreciation (7,221,440)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (6,964,428)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Deferred tax liabilities $ (12,048,377)us-gaap_DeferredIncomeTaxLiabilities $ (13,020,590)us-gaap_DeferredIncomeTaxLiabilities