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Note 3 - Property and Equipment, net (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Laboratory Equipment [Member]    
Property and equipment, gross $ 525,956 $ 510,106
Leasehold Improvements [Member]    
Property and equipment, gross 115,605 115,605
Other Furniture Fixtures And Equipment [Member]    
Property and equipment, gross 28,685 28,685
Property and equipment, gross 670,246 654,396
Accumulated depreciation and amortization (586,638) (557,703)
Property and equipment, net $ 83,608 $ 96,693