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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
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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

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