v3.8.0.1
Document and Entity Information - shares
9 Months Ended
Oct. 31, 2017
Dec. 15, 2017
Document And Entity Information    
Entity Registrant Name COMARCO INC  
Entity Central Index Key 0000022252  
Document Type 10-Q  
Document Period End Date Oct. 31, 2017  
Amendment Flag false  
Current Fiscal Year End Date --01-31  
Entity Filer Category Smaller Reporting Company  
Entity Common Stock, Shares Outstanding   14,614,165
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2018