| Cover | Apr. 23, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Apr. 23, 2024 |
| Entity File Number | 001-31540 |
| Entity Registrant Name | FLEXIBLE SOLUTIONS INTERNATIONAL, INC. |
| Entity Central Index Key | 0001069394 |
| Entity Tax Identification Number | 91-1922863 |
| Entity Incorporation, State or Country Code | NV |
| Entity Address, Address Line One | 6001 54 Ave. |
| Entity Address, City or Town | Tabor |
| Entity Address, State or Province | AB |
| Entity Address, Postal Zip Code | T1G 1X4 |
| City Area Code | (250) |
| Local Phone Number | 477-9969 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | FSI |
| Security Exchange Name | NYSEAMER |
| Entity Emerging Growth Company | false |
