XML 15 R1.htm IDEA: XBRL DOCUMENT v3.19.1
Document And Entity Information - USD ($)
 12 Months Ended
Jan. 31, 2019
Apr. 10, 2019
Jul. 31, 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 Voluntary Filers No    
Entity Well-known Seasoned Issuer No    
Entity Emerging Growth Company false    
Entity Small Business true    
Entity Common Stock, Shares Outstanding (in shares)   7,876,019  
Entity Public Float     $ 71,277,971
Entity Shell Company false    
Document Type 10-K    
Document Period End Date Jan. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false