Quarterly report pursuant to Section 13 or 15(d)


Cover - shares
6 Months Ended
Jun. 30, 2023
Aug. 07, 2023
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Jun. 30, 2023  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2023  
Current Fiscal Year End Date --12-31  
Entity File Number 001-40023  
Entity Registrant Name GT BIOPHARMA, INC.  
Entity Central Index Key 0000109657  
Entity Tax Identification Number 94-1620407  
Entity Incorporation, State or Country Code DE  
Entity Address, Address Line One 8000 Marina Blvd  
Entity Address, Address Line Two Suite 100  
Entity Address, City or Town Brisbane  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94005  
City Area Code 415  
Local Phone Number 919-4040  
Title of 12(b) Security Common Stock, $0.001 par value per share  
Trading Symbol GTBP  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   40,639,688