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Note 1 - Description of Business (Details Textual)	Mar. 31, 2024
Number of Skilled Nursing Centers	65
Number of Beds	8,421
Number of Assisted Living Facilities	24
Number of Independent Living Facilities	5
Number of Behavioral Health Hospitals	3
Number of Homecare Programs	35
Number of Hospice Agencies	30
Number of States in which Entity Operates	8

X

- Definition

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

+ References

No definition available.

+ Details

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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
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X

- Definition

The number of behavioral health hospitals.

+ References

No definition available.

+ Details

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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

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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

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

X

- Definition

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

+ References

No definition available.

+ Details

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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
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