v3.26.1
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 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Basic:        
Weighted average common shares outstanding (in shares) 15,617,655 15,462,135 15,579,854 15,450,286
Net income attributable to National HealthCare Corporation $ 40,319 $ 23,722 $ 76,176 $ 55,927
Earnings per common share, basic (in dollars per share) $ 2.58 $ 1.53 $ 4.89 $ 3.62
Diluted:        
Weighted average common shares outstanding (in shares) 15,617,655 15,462,135 15,579,854 15,450,286
Effects of dilutive instruments (in shares) 246,674 137,503 237,792 137,497
Weighted average common shares outstanding (in shares) 15,864,329 15,599,638 15,817,646 15,587,783
Net income attributable to National HealthCare Corporation $ 40,319 $ 23,722 $ 76,176 $ 55,927
Earnings per common share, diluted (in dollars per share) $ 2.54 $ 1.52 $ 4.82 $ 3.59