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Note 11 - Income Taxes (Details Textual) - USD ($)
12 Months Ended 186 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Income Tax Expense (Benefit) $ 0 $ 0 $ 0 $ 0
Research Tax Credit Carryforward [Member]        
Tax Credit Carryforward, Amount 892,000     892,000
Domestic Tax Authority [Member]        
Operating Loss Carryforwards $ 69.50     $ 69.50