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Note 16 - Contingencies, Commitments and Other Matters (Details Textual)	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Self Insurance Reserve	$ 114,032,000	$ 103,616,000
NHI Lease Agreement [Member]
Number of Skilled Nursing Centers Leased from NHI, Including Subleases	32
Number of Independent Living Centers Leased from NHI	3

X

- Definition

Number of Independent Living Centers under lease agreements with NHI

+ 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 under lease agreements with NHI including facilities subleased out.

+ References

No definition available.

+ Details

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

X

- Definition

Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(24))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: