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Note 5 - Non-operating Income (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Proceeds from Sale of Unconsolidated Company | $ 2,100,000 |  |  |
Gain (Loss) on Sale of Unconsolidated Company | $ 1,024,000 | $ 1,024,000 | $ (0) | $ (0)
Homecare Agency in Nashville, Tennessee [Member] |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |

X
- Definition Represents the amount of gain (loss) from sale of an unconsolidated company. + References No definition available. + Details
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Namespace Prefix: | nhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow associated with the sale of an unconsolidated company during the period. + References No definition available. + Details
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Namespace Prefix: | nhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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