Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

v3.21.1
Document and Entity Information - shares
3 Months Ended
Mar. 31, 2021
May 12, 2021
Cover [Abstract]    
Entity Registrant Name GT Biopharma, Inc.  
Entity Central Index Key 0000109657  
Document Type 10-Q  
Document Period End Date Mar. 31, 2021  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Is Entity's Reporting Status Current? Yes  
Entity Filer Category Non-accelerated Filer  
Entity Emerging Growth Company false  
Entity Small Business true  
Entity Shell Company false  
Entity Interactive Data Current Yes  
Entity Incorporation, State or Country Code DE  
Entity File Number 0-8092  
Entity Common Stock, Shares Outstanding   21,127,718
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2021