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Note 12 - Income Taxes - Deferred Tax Assets (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Net operating loss carryforwards $ 25,165,014 $ 23,030,884
Stock option compensation $ 6,937,512 6,083,848
Other 26,783
Valuation allowance $ (32,102,526) (29,141,515)
Net deferred tax asset 0 0
Intangible assets $ (2,274,526) $ (2,274,526)