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Note 4 - Other Revenues (Details Textual) | 3 Months Ended
--- | ---
Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($)
Number of Skilled Nursing Centers | 65 |
Insurance Services Revenue | $ 872,000 | $ 1,048,000
Workers Compensation Revenue [Member] |  |
Insurance Services Revenue | 582,000 | 736,000
Professional Liability Insurance [Member] |  |
Insurance Services Revenue | $ 290,000 | 312,000
National [Member] |  |
Number of Skilled Nursing Centers | 5 |
Property Management Fee Revenue | $ 1,320,000 | $ 1,190,000
FLORIDA |  |
Number of Skilled Nursing Centers | 4 |

X
- Definition Number of skilled nursing centers operated or managed as of the balance sheet date. + References No definition available. + Details
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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: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_FL
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |