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Note 3 - Acquisition of White Oak Senior Living - Pro Forma Financial Information (Details) - White Oak Senior Living Portfolio [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Net operating revenues and grant income	$ 358,334	$ 337,817	$ 1,065,418	$ 987,186
Income before income taxes	58,881	14,087	134,777	49,113
Net income attributable to NHC	$ 43,413	$ 10,431	$ 99,121	$ 34,064

X

- Definition

Amount before tax of pro forma income from continuing operations as if the business combination had been completed at the beginning of a period.

+ References

No definition available.

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X

- Definition

Total pro forma net operating revenue and grant income for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

No definition available.

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X

- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479328/805-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479328/805-10-50-2

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