Cover - USD ($)	12 Months Ended
	Dec. 31, 2023	Mar. 29, 2024	Jun. 30, 2023
Cover [Abstract]
Document Type	10-K/A
Amendment Flag	true
Amendment Description	This Amended 10-K is being filed since the 10-K originally filed was missing the signature of the accountants on their report.
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2023
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2023
Current Fiscal Year End Date	--12-31
Entity File Number	001-31540
Entity Registrant Name	FLEXIBLE SOLUTIONS INTERNATIONAL, INC.
Entity Central Index Key	0001069394
Entity Tax Identification Number	71-1630889
Entity Incorporation, State or Country Code	A0
Entity Address, Address Line One	6001 54 Ave.
Entity Address, City or Town	Taber
Entity Address, State or Province	AB
Entity Address, Country	CA
Entity Address, Postal Zip Code	T1G 1X4
City Area Code	(403)
Local Phone Number	223-2995
Title of 12(b) Security	Common Stock, $0.001 par value
Trading Symbol	FSI
Security Exchange Name	NYSEAMER
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
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 Public Float			$ 19,343,103
Entity Common Stock, Shares Outstanding		12,450,532
Documents Incorporated by Reference [Text Block]	None
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Auditor Name	Smythe LLP
Auditor Firm ID	995
Auditor Location	Vancouver, Canada