Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information (USD $)
12 Months Ended
Dec. 31, 2011
Mar. 15, 2012
Jun. 30, 2011
Document and Entity Information      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2011    
Entity Registrant Name REXAHN PHARMACEUTICALS, INC.    
Entity Central Index Key 0001228627    
Current Fiscal Year End Date --12-31    
Entity Filer Category Accelerated Filer    
Entity Common Stock, Shares Outstanding   95,345,656  
Document Fiscal Year Focus 2011    
Document Fiscal Period Focus FY    
Entity Public Float     $ 93,016,125
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes