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Note 13 - Selected Quarterly Financial Data (Details) - USD ($)
3 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Grant revenue $ 160,053 $ 93,130 $ 71,474 $ 103,424 $ 223,089 $ 322,086 $ 180,441 $ 157,340
Net loss $ (692,731) $ (619,899) $ (676,203) $ (700,454) $ (923,585) $ (514,515) $ (679,537) $ (615,918)
Net loss per share (in dollars per share) $ (0.02) $ (0.02) $ (0.02) $ (0.02) $ (0.03) $ (0.02) $ (0.03) $ (0.02)