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Note 3 - Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
June 30,
   
Six Months Ended
June 30,
 
   
2019
   
2018
   
2019
   
2018
 
Numerator:
                               
Net income (loss) attributable to SPAR Group, Inc.
 
$
1,523
    $
(1,763
)  
$
2,139
    $
(1,638
)
                                 
Denominator:
                               
Weighted average shares used in basic net income per share calculation
 
 
20,816
     
20,649
   
 
20,796
     
20,649
 
                                 
Weighted average shares used in diluted net income per share calculation
 
 
21,104
     
20,649
   
 
21,080
     
20,649
 
                                 
Basic and diluted net income (loss) per common share
 
$
0.07
    $
(0.09
)  
$
0.10
    $
(0.08
)