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Note 11 - Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Net operating loss carryforward $ 22,831,626us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 21,983,109us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Research and development tax credit carryforward 825,896us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 799,248us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Stock-based compensation expense 2,396,805us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 2,233,909us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Total deferred tax assets 26,054,327us-gaap_DeferredTaxAssetsGross 25,016,266us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities    
Depreciation (7,149)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (13,386)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Total deferred tax liabilities (7,149)us-gaap_DeferredIncomeTaxLiabilities (13,386)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax assets 26,047,178us-gaap_DeferredTaxAssetsLiabilitiesNet 25,002,881us-gaap_DeferredTaxAssetsLiabilitiesNet
Valuation allowance (26,047,178)us-gaap_DeferredTaxAssetsValuationAllowance (25,002,881)us-gaap_DeferredTaxAssetsValuationAllowance
$ 0us-gaap_DeferredTaxAssetsNet $ 0us-gaap_DeferredTaxAssetsNet