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Note 2 - Acquisition of White Oak Senior Living (Details Textual) - White Oak Senior Living Portfolio [Member] |  | 12 Months Ended
--- | --- | ---
Aug. 01, 2024 USD ($) | Dec. 31, 2024 USD ($)
Business Combination, Consideration Transferred | $ 221,400,000 |
Number of Healthcare Operations | 22 |
Number of Skilled Nursing Ficilitiess | 15 |
Number of Assisted Living Facilities | 2 |
Number of Independent Living Facilities | 4 |
Number of Licensed Skilled Nursing Beds | 1,928 |
Number of Assisted Living Units | 48 |
Number of Independent Living Units | 302 |
Number of Assisted Living and Independent Living Units | 2,278 |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  | $ 96,065,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  | 4,974,000
Business Combination, Acquisition Related Costs |  | $ 3,266,000

X
- Definition The number of assisted living and independent living units. + References No definition available. + Details
Name: | nhc_NumberOfAssistedLivingAndIndependentLivingUnits
Namespace Prefix: | nhc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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 The number of assisted living units. + References No definition available. + Details
Name: | nhc_NumberOfAssistedLivingUnits
Namespace Prefix: | nhc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of healthcare operations. + References No definition available. + Details
Name: | nhc_NumberOfHealthcareOperations
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 The number of independent living units. + References No definition available. + Details
Name: | nhc_NumberOfIndependentLivingUnits
Namespace Prefix: | nhc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of licensed skilled nursing beds. + References No definition available. + Details
Name: | nhc_NumberOfLicensedSkilledNursingBeds
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 This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479405/805-10-25-23 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 30 -Paragraph 8 -SubTopic 30 -Topic 805 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479637/805-30-30-8 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -SubTopic 30 -Topic 805 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479581/805-30-50-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 30 -Paragraph 7 -SubTopic 30 -Topic 805 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479637/805-30-30-7 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-2 + Details
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X
- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-2 + Details
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- Details
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