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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