Document and Entity Information - shares	3 Months Ended
	Sep. 30, 2020	Nov. 06, 2020
Entity Registrant Name	FONAR CORP
Entity Central Index Key	0000355019
Document Type	10-Q
Document Period End Date	Sep. 30, 2020
Document Fiscal Year Focus	2021
Current Fiscal Year End Date	--06-30
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity File Number	0-10248
Entity Incorporation State Country Code	DE
Is Entity Interactive Data Current	Yes
Is Entity's Reporting Status Current?	Yes
Is Entity a Small Business	true
Entity Filer Category	Non-accelerated Filer
Is Entity an Emerging Growth Company	false
Trading Symbol	FONR
Security Exchange Name	NASDAQ
Security 12B Title	Common Stock
Entity Shell Company	false
Common Stock
Entity Common Stock, Shares Outstanding		6,447,463
Class B Common Stock
Entity Common Stock, Shares Outstanding		146
Class C Common Stock
Entity Common Stock, Shares Outstanding		382,513
Class A Non-Voting Preferred Stock
Entity Common Stock, Shares Outstanding		313,438