Document and Entity Information - USD ($)	12 Months Ended
	Jun. 30, 2020	Sep. 15, 2020	Dec. 31, 2019
Entity Registrant Name	FONAR CORP
Entity Central Index Key	0000355019
Document Type	10-K
Document Period End Date	Jun. 30, 2020
Document Fiscal Year Focus	2020
Current Fiscal Year End Date	--06-30
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity File Number	0-10248
Is Entity Incorporation State Country Code	DE
Is Entity a Well-known Seasoned Issuer?	No
Is Entity a Voluntary Filer?	No
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
Is Entity a Shell Company	false
Entity Public Float			$ 123,000,000
Common Shares
Entity Common Stock, Shares Outstanding		6,447,463
Class B Members
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