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Note 11 - Deferred Tax Assets and Liabilities (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:    
Net operating loss carryforward $ 23,822,431 $ 22,806,391
Research and development tax credit carryforward 893,797 825,896
Stock-based compensation expense 2,419,892 2,396,805
Total deferred tax assets 27,136,120 26,029,092
Deferred tax liabilities    
Depreciation (5,086) (7,149)
Total deferred tax liabilities (5,086) (7,149)
Net deferred tax assets 27,131,034 26,021,943
Valuation allowance (27,131,034) (26,021,943)
$ 0 $ 0