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Note 6 - Non-operating Income (Details Textual) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 31, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Proceeds from Sale of Unconsolidated Company	$ 2,100,000			$ 2,100,000	$ 0
Gain (Loss) on Sale of Unconsolidated Company	$ 1,024,000	$ 0	$ 0	$ 1,024,000	$ (0)
Homecare Agency in Nashville, Tennessee [Member]
Equity Method Investment, Ownership Percentage						50.00%

X

- Definition

Represents the amount of gain (loss) from sale of an unconsolidated company.

+ References

No definition available.

+ Details

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Namespace Prefix:	nhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The cash inflow associated with the sale of an unconsolidated company during the period.

+ References

No definition available.

+ Details

Name:	nhc_ProceedsFromSaleOfUnconsolidatedCompany
Namespace Prefix:	nhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=nhc_HomecareAgencyInNashvilleTennesseeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: