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Note 5 - Non-operating Income (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jan. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Proceeds from Sale of Unconsolidated Company | $ 2,100,000 | $ 0 | $ 2,100,000
Gain (Loss) on Sale of Unconsolidated Company | $ 1,024,000 | $ (0) | $ 1,024,000

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