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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
Mar. 31, 2024
Mar. 31, 2023
Basic:    
Weighted average common shares outstanding (in shares) 15,350,240 15,337,423
Net income attributable to National HealthCare Corporation $ 26,213 $ 11,723
Earnings per common share, basic (in dollars per share) $ 1.71 $ 0.76
Diluted:    
Weighted average common shares outstanding (in shares) 15,350,240 15,337,423
Effects of dilutive instruments (in shares) 154,856 18,912
Weighted average common shares outstanding (in shares) 15,505,096 15,356,335
Net income attributable to National HealthCare Corporation $ 26,213 $ 11,723
Earnings per common share, diluted (in dollars per share) $ 1.69 $ 0.76