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Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Series B Convertible Preferred Stock [Member]            
Recorded value of Series C Preferred Shares at September 30, 2015 $ 76,095 $ 76,095        
Series C Convertible Preferred Stock [Member]            
Recorded value of Series C Preferred Shares at September 30, 2015 983,941        
Cash and cash equivalents $ 1,821,037 $ 1,101,651 $ 862,191 $ 2,513,861 $ 1,035,925 $ 1,167,980
Grant funds receivable 79,341   140,909    
Prepaid expenses and other current assets $ 75,276 44,503   43,569    
Total current assets 1,896,313 1,225,495   2,698,339    
Property and equipment, net 90,842 96,693   120,227    
Deposits 11,010 11,010   11,010    
Total assets 1,998,165 1,333,198   2,839,576    
Accounts payable 42,492 55,616   155,943    
Accrued expenses 5,000 52,490   96,406    
Amounts payable to a related party (Note 11) 70,729 78,917   60,000    
Total current liabilities $ 118,221 $ 187,023   $ 312,349    
Commitments (Note 6)      
Recorded value of Series C Preferred Shares at September 30, 2015   $ 76,095   $ 1,255,569    
Common stock, $.001 par value: Authorized shares – 150,000,000 and 75,000,000 at September 30, 2015 and December 31, 2014, respectively, Issued and outstanding shares – 31,950,813 at September 30, 2015 and December 31, 2014 $ 31,951 31,951   23,765    
Additional paid-in capital 32,570,153 30,823,769   28,239,392    
Accumulated deficit (31,782,196) (29,785,640)   (27,052,085)    
Total stockholders’ equity 1,879,944 1,146,175   2,527,227 $ 1,150,935 $ 703,607
Total liabilities and stockholders’ equity $ 1,998,165 $ 1,333,198   $ 2,839,576