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Note 13 - Selected Quarterly Financial Data (unaudited) - Selected Quarterly Financial Data (Details) (USD $)	3 Months Ended
	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	$ 223,089us-gaap_RevenueFromGrants	$ 322,086us-gaap_RevenueFromGrants	$ 180,441us-gaap_RevenueFromGrants	$ 157,340us-gaap_RevenueFromGrants	$ 174,738us-gaap_RevenueFromGrants	$ 1,004,211us-gaap_RevenueFromGrants	$ 441,561us-gaap_RevenueFromGrants	$ 797,040us-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

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.