Document And Entity Information	6 Months Ended
	Dec. 31, 2014	Jan. 27, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	LSI Industries Inc.
Document Type	10-Q
Current Fiscal Year End Date	--06-30
Entity Common Stock, Shares Outstanding		24,146,716
Amendment Flag	false
Entity Central Index Key	0000763532
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Well-known Seasoned Issuer	No
Document Period End Date	Dec. 31, 2014
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q2