Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2017	Apr. 15, 2017	Jul. 29, 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)		14,614,165
Entity Public Float			$ 1.2
Document Type	10-K
Document Period End Date	Jan. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Amendment Flag	false