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Note 14 - Net Income Per Share (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Year Ended December 31,
 
   
2019
   
2018
 
Numerator:
               
Net income (loss) attributable to SPAR Group, Inc.
  $
2,419
    $
(1,551
)
                 
Denominator:
               
Shares used in basic net income per share calculation
   
20,916
     
20,684
 
Effect of diluted securities:
               
Stock options and unvested restricted shares
   
241
     
 
Shares used in diluted net income per share calculations
   
21,157
     
20,684
 
                 
Basic net income (loss) per common share:    
$0.12
     
$ (0.07)
 
Diluted net income (loss) per common share:
   
$0.11
     
$ (0.07)