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Note 16 - Contingencies, Commitments and Other Matters (Details Textual) | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Self Insurance Reserve | $ 114,032,000 | $ 103,616,000
NHI Lease Agreement [Member] |  |
Number of Skilled Nursing Centers Leased from NHI, Including Subleases | 32 |
Number of Independent Living Centers Leased from NHI | 3 |

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

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- Definition Number of Skilled Nursing Centers under lease agreements with NHI including facilities subleased out. + References No definition available. + Details
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Namespace Prefix: | nhc_
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- Definition Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Details
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