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Note 13 - Selected Quarterly Financial Data (Details) - USD ($) | 3 Months Ended
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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)

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