Document And Entity Information - shares	6 Months Ended
	Jul. 31, 2016	Sep. 15, 2016
Document Information [Line Items]
Entity Registrant Name	Comarco Inc
Entity Central Index Key	0000022252
Trading Symbol	cmro
Current Fiscal Year End Date	--01-31
Entity Filer Category	Smaller Reporting Company
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding (in shares)		14,644,165
Document Type	10-Q
Document Period End Date	Jul. 31, 2016
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2
Amendment Flag	false