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NOTE 2 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Patient Fee Revenue Recognition - (Details) - USD ($) | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Net Patient Fee Revenue | $ 23,307,389 | $ 22,495,260
Commercial Insurance Managed Care [Member] |  |
Net Patient Fee Revenue | 4,100,440 | 4,545,987
Medicare Medicaid [Member] |  |
Net Patient Fee Revenue | 968,055 | 1,038,288
Workers Compensation Personal Injury [Member] |  |
Net Patient Fee Revenue | 15,011,111 | 16,028,737
Other Revenue Source [Member] |  |
Net Patient Fee Revenue | $ 3,227,783 | $ 882,248

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- References No definition available. + Details
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Namespace Prefix: | FONR_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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Name: | us-gaap_HealthCareOrganizationRevenueSourcesAxis=FONR_CommercialInsuranceManagedCareMember
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Data Type: | na
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Name: | us-gaap_HealthCareOrganizationRevenueSourcesAxis=FONR_MedicareMedicaidMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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Name: | us-gaap_HealthCareOrganizationRevenueSourcesAxis=FONR_WorkersCompensationPersonalInjuryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_HealthCareOrganizationRevenueSourcesAxis=FONR_OtherRevenueSourceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |