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Note 11 - Income Taxes (Details Textual) - USD ($)
12 Months Ended 174 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Domestic Tax Authority [Member]        
Operating Loss Carryforwards $ 67,200,000     $ 67,200,000
Research Tax Credit Carryforward [Member]        
Tax Credit Carryforward, Amount 894,000     894,000
Income Tax Expense (Benefit) $ 0 $ 0 $ 0 $ 0