Document And Entity Information - shares	9 Months Ended
	Oct. 31, 2018	Dec. 06, 2018
Document Information [Line Items]
Entity Registrant Name	Perma-Pipe International Holdings, Inc.
Entity Central Index Key	0000914122
Trading Symbol	ppih
Current Fiscal Year End Date	--01-31
Entity Filer Category	Non-accelerated Filer
Entity Current Reporting Status	Yes
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Common Stock, Shares Outstanding (in shares)		7,885,374
Document Type	10-Q
Document Period End Date	Oct. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Amendment Flag	false