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Entity Information Document (USD $)
 6 Months Ended
Jul. 31, 2012
Sep. 14, 2012
Jul. 31, 2011
Document Information [Line Items]      
Entity Registrant Name MFRI INC.    
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 Jul. 31, 2012    
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus Q2    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   6,923,996  
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 53,878,437