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Note 7 - Long-term Leases (Details Textual) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($)
Operating Lease, Expense | $ 11,345,000 | $ 10,886,000 | $ 34,038,000 | $ 31,804,000
NHI Lease Agreement [Member] |  |  |  |
Number of Skilled Nursing Centers Leased from NHI | 32 |  | 32 |
Number of Independent Living Centers Leased from NHI | 3 |  | 3 |
Number of Skilled Nursing Facilities Subleased | 4 |  | 4 |
Lessee, Operating Lease, Number of Renewal Options | 2 |  | 2 |
Lessee, Operating Lease, Renewal Term (Year) | 5 years |  | 5 years |
Operating Lease, Expense | $ 9,911,000 | $ 10,085,000 | $ 29,725,000 | $ 29,371,000

X
- Definition The number of options to renew an operating lease. + References No definition available. + Details
Name: | nhc_LesseeOperatingLeaseNumberOfRenewalOptions
Namespace Prefix: | nhc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Independent Living Centers under lease agreements with NHI + References No definition available. + Details
Name: | nhc_NumberOfIndependentLivingCentersLeasedFromNHI
Namespace Prefix: | nhc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Skilled Nursing Centers under lease agreements with NHI + References No definition available. + Details
Name: | nhc_NumberOfSkilledNursingCentersLeasedFromNHI
Namespace Prefix: | nhc_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of skilled nursing facilities that the company subleases. + References No definition available. + Details
Name: | nhc_NumberOfSkilledNursingFacilitiesSubleased
Namespace Prefix: | nhc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-3 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-4 + Details
Name: | us-gaap_OperatingLeaseExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |