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Note 1 - Description of Business (Details Textual) | Mar. 31, 2024
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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
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 centers operated or managed as of the balance sheet date. + References No definition available. + Details
Name: | nhc_NumberOfSkilledNursingCenters
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