v3.26.1
Cover - shares
6 Months Ended
Apr. 30, 2026
Jun. 10, 2026
Cover [Abstract]    
Entity Registrant Name PHARMA-BIO SERV, INC.  
Entity Central Index Key 0001304161  
Document Type 10-Q  
Amendment Flag false  
Current Fiscal Year End Date --10-31  
Entity Small Business true  
Entity Shell Company false  
Entity Emerging Growth Company false  
Entity Current Reporting Status Yes  
Document Period End Date Apr. 30, 2026  
Entity Filer Category Non-accelerated Filer  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2026  
Entity Common Stock Shares Outstanding   22,901,692
Document Quarterly Report true  
Document Transition Report false  
Entity File Number 000-50956  
Entity Incorporation State Country Code DE  
Entity Tax Identification Number 20-0653570  
Entity Address Address Line 1 Pharma-Bio Serv  
Entity Address Address Line 2 PO Box 1049  
Entity Address City Or Town Dorado  
Entity Address Country PR  
Entity Address Postal Zip Code 00646  
City Area Code 787  
Local Phone Number 278-2709  
Entity Interactive Data Current Yes