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Note 14 - Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
2018
    
2017
  
Net income (loss) attributable to Alaska Communications
   $
9,080
     $
(6,101
 )
Tax-effected interest expense attributable to convertible notes
    
 NA
      
 NA
  
Net income (loss) attributable to Alaska Communications assuming dilution
   $
9,080
     $
(6,101
 )
                 
Weighted average common shares outstanding:
                
Basic shares
    
53,042
      
52,232
  
Effect of stock-based compensation
    
798
      
-
  
Effect of 6.25% convertible notes
    
 NA
      
 NA
  
Diluted shares
    
53,840
      
52,232
  
                 
Income (loss) per share attributable to Alaska Communications:
                
Basic
   $
0.17
     $
(0.12
 )
Diluted
   $
0.17
     $
(0.12
 )