NOTE 9 - CONTROLLING AND NONCONTROLLING INTERESTS - Imperial Members Equity (Details) - Imperial Equity	Jun. 30, 2018 USD ($)
Class A Members
Opening Members Equity	$ 1,279,446
Distributions	(202,500)
Buyout	48,054
Redemption	(1,125,000)
Class B Members
Opening Members Equity	15,000,446
Ending Members Equity	$ 15,000,446

- Definition

On January 8, 2015, the Company purchased 20% of the Class A members ownership interest at a cost of $4,971,094. The Company has a 60.4% ownership interest in HDM after this transaction.

+ References

No definition available.

+ Details

Name:	FONR_Buyout
Namespace Prefix:	FONR_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Distributions to each class of members equity as of June 30, 2016, 2015 and 2014.

+ References

No definition available.

+ Details

Name:	FONR_Distributions
Namespace Prefix:	FONR_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Ending Members Equity for each class of members equity as of June 30, 2016, 2015 and 2014.

+ References

No definition available.

+ Details

Name:	FONR_EndingMembersEquity
Namespace Prefix:	FONR_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Opening Members Equity for each class of members equity as of June 30, 2016, 2015 and 2014.

+ References

No definition available.

+ Details

Name:	FONR_OpeningMembersEquity
Namespace Prefix:	FONR_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Redemption of cash to Class A Members (outside investors) in exchange for percentage of Imperial Managements Services

+ References

No definition available.

+ Details

Name:	FONR_Redemption
Namespace Prefix:	FONR_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=FONR_ImperialEquityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: