Entity information Document - USD ($)	3 Months Ended
	Apr. 30, 2018	Jun. 08, 2018	Jul. 31, 2017
Document Information
Entity Registrant Name	Perma-Pipe International Holdings, Inc.
Trading Symbol	PPIH
Entity Central Index Key	0000914122
Current Fiscal Year End Date	--01-31
Entity Filer Category	Smaller Reporting Company
Document Type	10-Q
Document Period End Date	Apr. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		7,725,842
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 55,628,183