Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information - shares
6 Months Ended
Jun. 30, 2020
Aug. 11, 2020
Cover [Abstract]    
Entity Registrant Name GT Biopharma, Inc.  
Entity Central Index Key 0000109657  
Document Type 10-Q/A  
Document Period End Date Jun. 30, 2020  
Amendment Flag true  
Amendment Description We are filing this Amendment No. 1 to the Quarterly Report on Form 10-Q for the quarter ended June 30, 2020 of GT Biopharma, Inc. (the “Original Form 10-Q”), as filed with the Securities and Exchange Commission on August 14, 2020 to correct certain clerical errors in the Original Form 10-Q. The Original Form 10-Q, as amended, reads in its entirety as set forth below.  
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   76,560,862
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2020