Document And Entity Information - shares	6 Months Ended
	Jul. 31, 2019	Sep. 05, 2019
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)		0
Entity Shell Company	false
Document Type	10-Q
Document Period End Date	Jul. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Amendment Flag	false
Title of 12(b) Security	Common Stock