Annual report pursuant to Section 13 and 15(d)


Cover - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Mar. 26, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2023    
Document Fiscal Period Focus FY    
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    
Trading Symbol GTBP    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
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 Public Float     $ 11.5
Entity Common Stock, Shares Outstanding   1,380,633  
Documents Incorporated by Reference In Part III, portions of the registrant’s 2024 Proxy Statement to be filed with the Securities and Exchange Commission within 120 days of the Registrant’s fiscal year end.    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Rule 10b5-1 Arrangement Adopted [Flag] false    
Non-Rule 10b5-1 Arrangement Adopted [Flag] false    
Rule 10b5-1 Arrangement Terminated [Flag] false    
Non-Rule 10b5-1 Arrangement Terminated [Flag] false    
Auditor Firm ID 572    
Auditor Name Weinberg & Company, P.A    
Auditor Location Los Angeles, California