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Note 12 - Income Taxes (Details) - Deferred Tax Assets and Liabilities (USD $)
Dec. 31, 2013
Dec. 31, 2012
Deferred tax assets:    
Net operating loss carryforward $ 21,971,742 $ 24,428,215
Research and development tax credit carryforward 799,248 785,201
Stock-based compensation expense 2,233,909 2,097,194
Total deferred tax assets 25,004,899 27,310,610
Deferred tax liabilities    
Depreciation (2,019) (14,869)
Total deferred tax liabilities (2,019) (14,869)
Net deferred tax assets 25,002,880 27,295,741
Valuation allowance (25,002,880) (27,295,741)
$ 0 $ 0