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SEGMENT AND RELATED INFORMATION - Foreign Product Sales - (Details) | 12 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Foreign Product Sales | 48.90% | 69.30%
DOMINICAN REPUBLIC |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Foreign Product Sales | 12.00% | 67.00%
CANADA |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Foreign Product Sales | 0.60% | 0.10%
GERMANY |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Foreign Product Sales | 0.00% | 2.10%
PUERTO RICO |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Foreign Product Sales | 36.30% | 0.10%

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- Definition Foreign Product Sales + References No definition available. + Details
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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
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_StatementGeographicalAxis=country_DO
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Data Type: | na
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Data Type: | na
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- Details
Name: | srt_StatementGeographicalAxis=country_DE
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Data Type: | na
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- Details
Name: | srt_StatementGeographicalAxis=country_PR
Namespace Prefix: |
Data Type: | na
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