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Note 8- Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended March 31
 
   
2019
   
2018
 
Basic:
               
Weighted average common shares outstanding
   
15,256,189
     
15,216,635
 
Net income (loss) attributable to National HealthCare Corporation
  $
21,269
    $
(2,791
)
Earnings (loss) per common share, basic
  $
1.39
    $
(0.18
)
                 
Diluted:
               
Weighted average common shares outstanding
   
15,256,189
     
15,216,635
 
Effects of dilutive instruments
   
67,936
     
-
 
Weighted average common shares outstanding
   
15,324,125
     
15,216,635
 
                 
Net income (loss) attributable to National HealthCare Corporation
  $
21,269
    $
(2,791
)
Earnings (loss) per common share, diluted
  $
1.39
    $
(0.18
)