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v3.25.2

Note 4 - Other Revenues (Details Textual) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($)
Insurance Services Revenue | $ 831,000 | $ 816,000 | $ 1,645,000 | $ 1,688,000
Workers Compensation Revenue [Member] |  |  |  |
Insurance Services Revenue | 541,000 | 527,000 | 1,066,000 | 1,109,000
Professional Liability Insurance [Member] |  |  |  |
Insurance Services Revenue | $ 289,000 | 289,000 | $ 579,000 | 579,000
National [Member] |  |  |  |
Number of Skilled Nursing Centers | 5 |  | 5 |
Property Management Fee Revenue | $ 1,376,000 | $ 1,346,000 | $ 2,784,000 | $ 2,666,000
FLORIDA |  |  |  |
Number of Skilled Nursing Centers | 4 |  | 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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

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

X
- Details
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Namespace Prefix: |
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Period Type: |