v3.26.3
Note 9 - 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 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Basic:        
Weighted average common shares outstanding (in shares) 15,638,814 15,484,464 15,599,724 15,461,804
Net income attributable to National HealthCare Corporation $ 13,637 $ 39,239 $ 89,813 $ 95,166
Earnings per common share, basic (in dollars per share) $ 0.87 $ 2.53 $ 5.76 $ 6.15
Diluted:        
Weighted average common shares outstanding (in shares) 15,638,814 15,484,464 15,599,724 15,461,804
Effects of dilutive instruments (in shares) 326,081 180,066 267,233 151,701
Weighted average common shares outstanding (in shares) 15,964,895 15,664,530 15,866,957 15,613,505
Net income attributable to National HealthCare Corporation $ 13,637 $ 39,239 $ 89,813 $ 95,166
Earnings per common share, diluted (in dollars per share) $ 0.85 $ 2.5 $ 5.66 $ 6.1