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Note 13 - Selected Quarterly Financial Data (unaudited) - Selected Quarterly Financial Data (Details) - USD ($) | 3 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013
Grant revenue | $ 223,089 | $ 322,086 | $ 180,441 | $ 157,340 | $ 174,738 | $ 1,004,211 | $ 441,561 | $ 797,040
Net loss | $ (923,585) | $ (514,515) | $ (679,537) | $ (615,918) | $ (871,714) | $ (190,148) | $ (526,284) | $ (696,797)
Net loss per share (in dollars per share) | $ (0.03) | $ (0.02) | $ (0.03) | $ (0.02) | $ (0.04) | $ (0.01) | $ (0.02) | $ (0.03)

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