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Note 7 - Income Taxes (Details) - Deferred Income Tax Assets and Liabilities (USD $)
Dec. 31, 2014
Dec. 31, 2013
Deferred income tax assets:    
Allowance for doubtful accounts $ 150us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts $ 98us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Capitalized inventory costs 306,592us-gaap_DeferredTaxAssetsInventory 208,384us-gaap_DeferredTaxAssetsInventory
Warrants and stock-based compensation 44,151us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 48,591us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Accrued expenses, reserves, and other 64,747us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther 101,050us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
Total deferred income tax assets 415,640us-gaap_DeferredTaxAssetsGross 358,123us-gaap_DeferredTaxAssetsGross
Deferred income tax liabilities:    
Property and equipment depreciation 1,299,826us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 1,074,646us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Goodwill and other intangible assets amortization 202,328us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets 186,501us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets
Total deferred income tax liabilities 1,502,154us-gaap_DeferredIncomeTaxLiabilities 1,261,147us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax asset (liability) $ (1,086,514)us-gaap_DeferredTaxLiabilities $ (903,024)us-gaap_DeferredTaxLiabilities