Document And Entity Information - shares	9 Months Ended
	Mar. 31, 2023	Apr. 28, 2023
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2023
Document Transition Report	false
Entity File Number	0-13375
Entity Registrant Name	LSI Industries Inc.
Entity Incorporation, State or Country Code	OH
Entity Tax Identification Number	31-0888951
Entity Address, Address Line One	10000 Alliance Road
Entity Address, City or Town	Cincinnati
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	45242
City Area Code	513
Local Phone Number	793-3200
Title of 12(b) Security	Common Stock, no par value
Trading Symbol	LYTS
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		28,367,653
Entity Central Index Key	0000763532
Current Fiscal Year End Date	--06-30
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Amendment Flag	false