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Note 1 - Description of Business (Details Textual) | Jun. 30, 2025
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Number of Skilled Nursing Facilities | 80
Number of Beds | 10,329
Number of Assisted Living Facilities | 26
Number of Independent Living Facilities | 9
Number of Behavioral Health Hospitals | 3
Number of Homecare Programs | 34
Number of Hospice Agencies | 33
Number of States in which Entity Operates | 9

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 facilities operated or managed as of the balance sheet date. + References No definition available. + Details
Name: | nhc_NumberOfSkilledNursingFacilities1
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