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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, 2025
Mar. 31, 2024
Basic:    
Weighted average common shares outstanding (in shares) 15,438,306 15,350,240
Net income attributable to National HealthCare Corporation $ 32,205 $ 26,213
Earnings per common share, basic (in dollars per share) $ 2.09 $ 1.71
Diluted:    
Weighted average common shares outstanding (in shares) 15,438,306 15,350,240
Effects of dilutive instruments (in shares) 137,446 154,856
Weighted average common shares outstanding (in shares) 15,575,752 15,505,096
Net income attributable to National HealthCare Corporation $ 32,205 $ 26,213
Earnings per common share, diluted (in dollars per share) $ 2.07 $ 1.69