Quarterly report pursuant to Section 13 or 15(d)


Cover - shares
6 Months Ended
Jun. 30, 2021
Aug. 15, 2021
Cover [Abstract]    
Entity Registrant Name GT BIOPHARMA, INC  
Entity Central Index Key 0000109657  
Document Type 10-Q/A  
Amendment Flag true  
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 Jun. 30, 2021  
Entity Filer Category Non-accelerated Filer  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2021  
Entity Common Stock Shares Outstanding   30,482,193
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
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  
Security 12b Title Common Stock, $0.001 par value per share  
Trading Symbol GTBP  
Security Exchange Name NASDAQ  
Amendment Description We are filing this Amendment 1 to the Quarterly Report on 10Q for the Quarter Ended June 30, 2021 of GT Biopharma, Inc. (“the Original Form 10Q”), as filed with the Securities and Exchange Commission on August 23, 2021 to properly reflect the prior comparative period restatements that have previously been reported.  The Original Form 10Q, as amended, reads in its entirety as set forth below.