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Entity information Document (USD $)
 3 Months Ended
Apr. 30, 2015
Jun. 05, 2015
Jul. 31, 2014
Document Information      
Entity Registrant Name MFRI INC.    
Trading Symbol MFRI    
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, 2015    
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus Q1    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   7,246,010dei_EntityCommonStockSharesOutstanding  
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 69,518,913dei_EntityPublicFloat