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Condensed Consolidated Balance Sheets (Current Period Unaudited) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 2,010,326 $ 2,513,861
Grant funds receivable   140,909
Prepaid expenses and other current assets 37,768 43,569
Total current assets 2,048,094 2,698,339
Property and equipment, net 106,355 120,227
Other assets 18,510 21,010
Total assets 2,172,959 2,839,576
Current liabilities:    
Accounts payable 134,744 155,943
Accrued expenses 13,557 96,406
Amounts payable to Emory University (a related party) 87,042 60,000
Total current liabilities 235,343 312,349
Commitments (Note 5)      
Common stock, $.001 par value:    
Issued and outstanding shares – 24,968,037 and 23,765,180 at March 31, 2014 and December 31, 2013, respectively 24,968 23,765
Additional paid-in capital 28,591,415 28,239,392
Deficit accumulated during the development stage (27,668,003) (27,052,085)
Total stockholders’ equity 1,937,616 2,527,227
Total liabilities and stockholders’ equity 2,172,959 2,839,576
Series A Convertible Preferred Stock [Member]
    
Authorized shares – 10,000,000    
Preferred stock   60,586
Series B Convertible Preferred Stock [Member]
    
Authorized shares – 10,000,000    
Preferred stock $ 989,236 $ 1,255,569