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Note 5 - Income Taxes (Details) - Deferred Tax Assets and Liabilities (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred Tax Assets and Liabilities [Abstract]    
Inventories $ 279us-gaap_DeferredTaxAssetsInventory $ 325us-gaap_DeferredTaxAssetsInventory
Trade accounts receivable 11us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 6us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Deferred revenue 15us-gaap_DeferredTaxAssetsDeferredIncome 325us-gaap_DeferredTaxAssetsDeferredIncome
Other accruals 827us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther 605us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
Total current deferred tax assets 1,132us-gaap_DeferredTaxAssetsGrossCurrent 1,261us-gaap_DeferredTaxAssetsGrossCurrent
Depreciation 161us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 239us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Other 417us-gaap_DeferredTaxAssetsOther 377us-gaap_DeferredTaxAssetsOther
Net operating loss carryforwards 17,934us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 16,323us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Total noncurrent deferred tax assets 18,512us-gaap_DeferredTaxAssetsGross 16,939us-gaap_DeferredTaxAssetsGross
Valuation allowance for deferred tax assets (19,644)us-gaap_DeferredTaxAssetsValuationAllowance (18,200)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets, net of valuation allowance $ 0us-gaap_DeferredTaxAssetsNet $ 0us-gaap_DeferredTaxAssetsNet