| Cover | 12 Months Ended |
| Jun. 30, 2021 | |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Feb. 14, 2022 |
| Entity File Number | 0-10248 |
| Entity Registrant Name | FONAR CORPORATION |
| Entity Central Index Key | 0000355019 |
| Entity Tax Identification Number | 11-2464137 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 110 Marcus Drive |
| Entity Address, City or Town | Melville |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 11747 |
| City Area Code | 631 |
| Local Phone Number | 694-2929 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $.0001 par value |
| Trading Symbol | FONR |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
