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Note 11 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Net operating loss carryforward $ 22,831,626 $ 21,983,109
Research and development tax credit carryforward 825,896 799,248
Stock-based compensation expense 2,396,805 2,233,909
Total deferred tax assets 26,054,327 25,016,266
Deferred tax liabilities    
Depreciation (7,149) (13,386)
Total deferred tax liabilities (7,149) (13,386)
Net deferred tax assets 26,047,178 25,002,881
Valuation allowance (26,047,178) (25,002,881)
$ 0 $ 0