| Cover | Nov. 15, 2021 |
| Cover [Abstract] | |
| Entity Registrant Name | Pharma-Bio Serv, Inc. |
| Entity Central Index Key | 0001304161 |
| Document Type | 8-K |
| Amendment Flag | false |
| Entity Emerging Growth Company | false |
| Document Period End Date | Nov. 15, 2021 |
| Entity File Number | 0-50956 |
| Entity Incorporation State Country Code | DE |
| Entity Tax Identification Number | 20-0653570 |
| City Area Code | 787 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Local Phone Number | 278-2709 |
| Entity Address Postal Zip Code | 00646 |
| Entity Address Address Line 1 | 6 Road 696 |
| Entity Address City Or Town | Dorado |
| Entity Address Country | PR |
