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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 us-gaap_RevenueFromGrants | $ 322,086 us-gaap_RevenueFromGrants | $ 180,441 us-gaap_RevenueFromGrants | $ 157,340 us-gaap_RevenueFromGrants | $ 174,738 us-gaap_RevenueFromGrants | $ 1,004,211 us-gaap_RevenueFromGrants | $ 441,561 us-gaap_RevenueFromGrants | $ 797,040 us-gaap_RevenueFromGrants
Net loss | $ (923,585)us-gaap_NetIncomeLoss | $ (514,515)us-gaap_NetIncomeLoss | $ (679,537)us-gaap_NetIncomeLoss | $ (615,918)us-gaap_NetIncomeLoss | $ (871,714)us-gaap_NetIncomeLoss | $ (190,148)us-gaap_NetIncomeLoss | $ (526,284)us-gaap_NetIncomeLoss | $ (696,797)us-gaap_NetIncomeLoss
Net loss per share (in dollars per share) | $ (0.03)us-gaap_EarningsPerShareBasic | $ (0.02)us-gaap_EarningsPerShareBasic | $ (0.03)us-gaap_EarningsPerShareBasic | $ (0.02)us-gaap_EarningsPerShareBasic | $ (0.04)us-gaap_EarningsPerShareBasic | $ (0.01)us-gaap_EarningsPerShareBasic | $ (0.02)us-gaap_EarningsPerShareBasic | $ (0.03)us-gaap_EarningsPerShareBasic

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