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Note 8 - Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax liabilities:    
Property, Plant and Equipment $ 0us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment $ 232us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Intangible Assets 4,462us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets 4,242us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Total deferred tax liabilities 4,462us-gaap_DeferredIncomeTaxLiabilities 4,474us-gaap_DeferredIncomeTaxLiabilities
Deferred tax assets:    
Property, Plant and Equipment 88us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 0us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Net operating loss carryforwards 20,164us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 18,976us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Tax credit carryforwards 1,455us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 1,380us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Intangible assets 3,841us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 4,266us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Accrued expenses, reserves and other 2,509us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 2,984us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Total deferred tax assets 28,057us-gaap_DeferredTaxAssetsGross 27,606us-gaap_DeferredTaxAssetsGross
Valuation allowance (27,951)us-gaap_DeferredTaxAssetsValuationAllowance (27,292)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets 106us-gaap_DeferredTaxAssetsNet 314us-gaap_DeferredTaxAssetsNet
Net deferred tax liabilities $ 4,356us-gaap_DeferredTaxLiabilities $ 4,160us-gaap_DeferredTaxLiabilities