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Note 8 - Components of Defered Tax Assets (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:    
Net operating loss carryforward $ 94,465,000 $ 59,513,000
Deferred Tax Assets, Tax Credit Carryforwards, Research 11,181,000 7,667,000
Stock-based compensation 6,726,000 5,128,000
Other, net 1,345,000 964,000
Total deferred tax assets 113,717,000 73,272,000
Valuation allowance for net deferred tax assets (113,717,000) (73,272,000)
Net deferred taxes $ 0 $ 0