Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Details Narrative)

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Summary of Significant Accounting Policies (Details Narrative) - USD ($)
12 Months Ended
Dec. 31, 2024
Feb. 05, 2024
Feb. 02, 2024
Dec. 31, 2023
Dec. 31, 2022
Cash Equivalents, at Carrying Value $ 3,800,000     $ 443,000  
Short-term investments     12,893,000  
Warrant liability $ 252,000     $ 1,052,000 $ 18,000
Revers stock split ratio On February 2, 2024, the Company effectuated a reverse stock-split of its common stock, par value $0.001 per share, at a ratio of 1 for 30. The Company’s common stock began trading on a reverse stock-split-adjusted basis on The Nasdaq Capital Market on February 5, 2024 under the existing trading symbol “GTBP.”        
Common stock, shares outstanding 2,234,328     1,380,633  
Common stock, shares authorized 250,000,000     250,000,000  
Cash, FDIC insured amount $ 250,000        
Common Stock [Member]          
Common stock, shares outstanding   1,380,633 41,419,000