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SEGMENT AND RELATED INFORMATION - Foreign product sales - (Details) | 12 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Foreign product sales | 1.40% | 0.20%
Puerto Rico |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Foreign product sales | 1.40% |
CANADA |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Foreign product sales |  | 0.20%

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- References No definition available. + Details
Name: | FONR_ForeignProductSales
Namespace Prefix: | FONR_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=FONR_TwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=country_CA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |