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Note 15 - Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Year ended December 31,
(in thousands, except per share data)
  
2018
    
2017
  
Basic
 
 
 
 
  
 
 
 
Net income attributable to Intelligent Systems Corporation
   $
6,244
     $
374
  
Weighted average common shares outstanding
    
8,796
      
8,766
  
Earnings per share
   $
0.71
     $
0.04
  
                 
Diluted
 
 
 
 
  
 
 
 
Net income (loss) attributable to Intelligent Systems Corporation
   $
6,244
     $
374
  
Weighted average common shares outstanding
    
8,796
      
8,766
  
Effect of dilutive potential common shares: stock options
    
152
      
116
  
Total
    
8,948
      
8,882
  
Earnings per share
   $
0.70
     $
0.04