Quarterly report pursuant to Section 13 or 15(d)

Cover

v3.21.2
Cover - shares
 9 Months Ended
Sep. 30, 2021
Nov. 12, 2021
Cover [Abstract]    
Entity Registrant Name GT BIOPHARMA, INC.  
Entity Central Index Key 0000109657  
Document Type 10-Q  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Small Business true  
Entity Shell Company false  
Entity Emerging Growth Company false  
Entity Current Reporting Status Yes  
Document Period End Date Sep. 30, 2021  
Entity Filer Category Non-accelerated Filer  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2021  
Entity Common Stock Shares Outstanding   30,582,354
Document Quarterly Report true  
Entity Interactive Data Current Yes  
Document Transition Report false  
Entity File Number 001-40023  
Entity Incorporation State Country Code DE  
Entity Tax Identification Number 94-1620407  
Entity Address Address Line 1 9350 Wilshire Blvd  
Entity Address Address Line 2 Suite 203  
Entity Address City Or Town Beverly Hills  
Entity Address State Or Province CA  
Entity Address Postal Zip Code 90212  
City Area Code 800  
Local Phone Number 304-9888  
Trading Symbol GTBP  
Security Exchange Name NASDAQ  
Security 12b Title Common Stock, $0.001 par value per share