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Note 12 - Income Taxes (Details) - Significant Components of Deferred Tax Assets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Net operating loss carryforwards $ 5,770us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 4,203us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Capitalized start up costs 7,751us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther 7,156us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther
Research and development credits 189us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 162us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Accruals and reserves 169us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 99us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Total deferred tax assets 13,879us-gaap_DeferredTaxAssetsGross 11,620us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:    
Depreciation and amortization (13)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (11)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Valuation allowance $ (13,866)us-gaap_DeferredTaxAssetsValuationAllowance $ (11,609)us-gaap_DeferredTaxAssetsValuationAllowance