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Note 4 - Other Revenues (Details Textual)	3 Months Ended
	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)
Insurance Services Revenue	$ 814,000	$ 872,000
Workers Compensation Revenue [Member]
Insurance Services Revenue	525,000	582,000
Professional Liability Insurance [Member]
Insurance Services Revenue	$ 289,000	290,000
National [Member]
Number of Skilled Nursing Centers	5
Property Management Fee Revenue	$ 1,408,000	$ 1,320,000
FLORIDA
Number of Skilled Nursing Centers	4

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

Revenue from insurance services, including net premiums earned, gain on sale of insurance block, agency management fees and insurance contract fees and commissions.

+ References

No definition available.

+ Details

Name:	us-gaap_InsuranceServicesRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of revenue derived from managing real estate properties.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyManagementFeeRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	srt_ProductOrServiceAxis=nhc_WorkersCompensationRevenueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=us-gaap_ProfessionalLiabilityInsuranceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_HealthCareOrganizationRevenueSourcesAxis=nhc_NationalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=stpr_FL
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: