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Note 3 - Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
March 31
,
 
   
20
19
   
20
18
 
Numerator:
               
Net income attributable to SPAR Group, Inc.
 
$
619
    $
124
 
                 
Denominator:
               
Weighted average shares used in basic net income per share calculation
 
 
20,777
     
20,648
 
                 
Weighted average shares used in diluted net income per share calculation
 
 
21,051
     
21,599
 
                 
Basic and diluted net income per common share
 
$
0.03
    $
0.01