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Note 7 - Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended June 30
   
Six Months Ended June 30
 
 
 
2017
   
2016
   
2017
   
2016
 
Basic:
                               
Weighted average common shares outstanding
   
15,189,818
     
15,266,559
     
15,181,700
     
15,091,732
 
Net income attributable to National Health
Care Corporation
  $
10,655
    $
11,866
    $
23,383
    $
25,565
 
Earnings per common share, basic
  $
0.70
    $
0.78
    $
1.54
    $
1.69
 
                                 
Diluted:
                               
Weighted average common shares outstanding
   
15,189,818
     
15,266,559
     
15,181,700
     
15,091,732
 
Dilutive effect of stock options
   
30,630
     
22,545
     
34,636
     
23,406
 
Dilutive effect of contingent issuable stock
   
-
     
-
     
-
     
97,137
 
Weighted a
verage common shares outstanding
   
15,220,448
     
15,289,104
     
15,216,336
     
15,212,275
 
                                 
Net income attributable to National Health
Care Corporation
  $
10,655
    $
11,866
    $
23,383
    $
25,565
 
Earnings per common share, diluted
  $
0.70
    $
0.78
    $
1.54
    $
1.68