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Note 7 - Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended March 31
  
(in thousands, except for share and per share amounts)
  
2017
    
2016
  
Basic:
                
Weighted average common shares outstanding
    
15,173,491
      
14,916,905
  
Net income attributable to National HealthCare Corporation
   $
12,728
     $
13,699
  
Earnings per common share, basic
   $
0.84
     $
0.92
  
                 
Diluted:
                
Weighted average common shares outstanding
    
15,173,491
      
14,916,905
  
Dilutive effect of stock options
    
38,642
      
24,266
  
Dilutive effect of contingent issuable stock
    
–
      
194,275
  
Weighted average common shares outstanding
    
15,212,133
      
15,135,446
  
                 
Net income attributable to National HealthCare Corporation
   $
12,728
     $
13,699
  
Earnings per common share, diluted
   $
0.84
     $
0.91