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Note 1 - Description of Business (Details Textual)	Mar. 31, 2025
Number of Skilled Nursing Facilities	80
Number of Beds	10,329
Number of Assisted Living Facilities	26
Number of Independent Living Facilities	9
Number of Behavioral Health Hospitals	3
Number of Homecare Programs	34
Number of Hospice Agencies	33
Number of States in which Entity Operates	9

X

- Definition

Number of assisted living facilities in which company operates as of the Balance Sheet date.

+ References

No definition available.

+ Details

Name:	nhc_NumberOfAssistedLivingFacilities
Namespace Prefix:	nhc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of licensed skilled nursing beds that are operated or managed as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	nhc_NumberOfBeds
Namespace Prefix:	nhc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of behavioral health hospitals.

+ References

No definition available.

+ Details

Name:	nhc_NumberOfBehavioralHealthHospitals
Namespace Prefix:	nhc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of homecare Programs in which the company operates as of the Balance Sheet date.

+ References

No definition available.

+ Details

Name:	nhc_NumberOfHomecarePrograms
Namespace Prefix:	nhc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the number of hospice agencies operated or managed by the reporting entity as of the specified date.

+ References

No definition available.

+ Details

Name:	nhc_NumberOfHospiceAgencies
Namespace Prefix:	nhc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of independent living facilities in which the company operates as of the Balance Sheet date.

+ References

No definition available.

+ Details

Name:	nhc_NumberOfIndependentLivingFacilities
Namespace Prefix:	nhc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of skilled nursing facilities operated or managed as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	nhc_NumberOfSkilledNursingFacilities1
Namespace Prefix:	nhc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant