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Note 11 - Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
   
Six Months Ended
 
   
June 30,
   
June 30,
 
   
2018
   
2017
   
2018
   
2017
 
                                 
Net income (loss) attributable to Alaska Communications
   $
3,442
     $
(2,798
 )   $
5,543
     $
(3,474
 )
                                 
Weighted average common shares outstanding:
                                
Basic shares
    
53,111
      
52,341
      
52,897
      
52,177
  
Effect of stock-based compensation
    
777
      
-
      
932
      
-
  
Diluted shares
    
53,888
      
52,341
      
53,829
      
52,177
  
                                 
Net income (loss) per share attributable to Alaska Communications:
                                
Basic
   $
0.06
     $
(0.05
 )   $
0.10
     $
(0.07
 )
Diluted
   $
0.06
     $
(0.05
 )   $
0.10
     $
(0.07
 )