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NOTE 16 - SEGMENT AND RELATED INFORMATION - Foreign Product Sales - (Details) | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Foreign Product Sales | 41.50% | 55.90% | 19.60%
United Arab Emerites |  |  |
Foreign Product Sales | 7.10% | 45.40% |
Canada |  |  |
Foreign Product Sales |  |  | 0.30%
England |  |  |
Foreign Product Sales | 29.90% | 4.80% | 18.50%
Germany |  |  |
Foreign Product Sales | 4.50% |  | 0.60%
Puerto Rico |  |  |
Foreign Product Sales |  | 5.70% | 0.20%

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- Definition Foreign Product Sales + References No definition available. + Details
Name: | FONR_ForeignProductSales
Namespace Prefix: | FONR_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementGeographicalAxis=country_AE
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
Name: | us-gaap_StatementGeographicalAxis=country_GB
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementGeographicalAxis=country_DE
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementGeographicalAxis=country_PR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |