Document And Entity Information	9 Months Ended
	Sep. 30, 2014	Nov. 01, 2014
Document And Entity Information [Abstract]
Entity Central Index Key	0000943034
Entity Registrant Name	IMAGE SENSING SYSTEMS INC
Entity Filer Category	Smaller Reporting Company
Document Type	10-Q
Document Period End Date	Sep. 30, 2014
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2014
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		4,987,795