Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

v3.20.1
Document and Entity Information - shares
3 Months Ended
Mar. 31, 2020
May 07, 2020
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2020  
Entity Registrant Name REXAHN PHARMACEUTICALS, INC.  
Entity Central Index Key 0001228627  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q1  
Entity Current Reporting Status Yes  
Entity Small Business true  
Entity Shell Company false  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   4,019,141