Document And Entity Information - shares	6 Months Ended
	Dec. 31, 2015	Feb. 02, 2016
Entity Registrant Name	LSI INDUSTRIES INC
Entity Central Index Key	0000763532
Trading Symbol	lyts
Current Fiscal Year End Date	--06-30
Entity Filer Category	Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding (in shares)		24,689,131
Document Type	10-Q
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q2
Amendment Flag	false