Document And Entity Information - USD ($)	12 Months Ended
	Jan. 31, 2022	Apr. 14, 2022	Jul. 31, 2021
Document Information [Line Items]
Entity Central Index Key	0000914122
Entity Registrant Name	Perma-Pipe International Holdings, Inc.
Amendment Flag	false
Current Fiscal Year End Date	--01-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2021
Document Type	10-K
Document Annual Report	true
Document Period End Date	Jan. 31, 2022
Document Transition Report	false
Entity File Number	001-32530
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-3922969
Entity Address, Address Line One	6410 W. Howard Street
Entity Address, City or Town	Niles
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60714
City Area Code	847
Local Phone Number	966-1000
Title of 12(b) Security	Common Stock, $.01 par value per share
Trading Symbol	PPIH
Security Exchange Name	NASDAQ
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
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Public Float			$ 53,405,526.85
Entity Common Stock, Shares Outstanding		8,154,154
Auditor Name	GRANT THORNTON LLP
Auditor Location	Houston, Texas
Auditor Firm ID	248