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Note 8 - Earnings Per Share - Summary of Earnings and Weighted Average Number of Common Shares Used in Calculation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Basic:        
Weighted average common shares outstanding (in shares) 15,391,535 15,297,435 15,371,150 15,317,319
Net income attributable to National HealthCare Corporation $ 26,844 $ 16,281 $ 53,057 $ 28,004
Earnings per common share, basic (in dollars per share) $ 1.74 $ 1.06 $ 3.45 $ 1.83
Diluted:        
Weighted average common shares outstanding (in shares) 15,391,535 15,297,435 15,371,150 15,317,319
Effects of dilutive instruments (in shares) 164,077 24,909 159,474 21,921
Weighted average common shares outstanding (in shares) 15,555,612 15,322,344 15,530,624 15,339,240
Net income attributable to National HealthCare Corporation $ 26,844 $ 16,281 $ 53,057 $ 28,004
Earnings per common share, diluted (in dollars per share) $ 1.73 $ 1.06 $ 3.42 $ 1.83