XML 28 R49.htm IDEA: XBRL DOCUMENT v2.4.0.8
Note 8 - Income Taxes (Details) - Deferred Tax Assets and Liabilities (USD $)
Dec. 31, 2012
Dec. 31, 2011
Deferred tax assets:    
Net operating loss carryforward $ 24,429,472 $ 24,872,082
Research and development tax credit carryforward 764,000 763,690
Stock-based compensation expense 2,097,194 1,991,769
Total deferred tax assets 27,290,631 27,627,541
Deferred tax liabilities    
Depreciation (16,125) (36,311)
Total deferred tax liabilities (16,125) (36,311)
Net deferred tax assets 27,274,506 27,591,230
Valuation allowance $ (27,274,506) $ (27,591,230)