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Cover - shares
 6 Months Ended
Jun. 30, 2021
Aug. 13, 2021
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Jun. 30, 2021  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2021  
Current Fiscal Year End Date --12-31  
Entity File Number 000-51353  
Entity Registrant Name Protagenic Therapeutics, Inc.\new  
Entity Central Index Key 0001022899  
Entity Tax Identification Number 06-1390025  
Entity Incorporation, State or Country Code DE  
Entity Address, Address Line One 149 Fifth Avenue  
Entity Address, Address Line Two Suite 500  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10010  
City Area Code (212)  
Local Phone Number 994-8200  
Title of 12(b) Security Common Stock, par value $0.0001  
Trading Symbol PTIX  
Security Exchange Name NASDAQ  
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 Common Stock, Shares Outstanding   16,699,651