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Note 4 - Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
September
30
,
    
Nine
Months Ended
September
30
,
  
   
20
18
    
20
17
    
20
18
    
20
17
  
Numerator:
                                
Net income (loss) attributable to SPAR Group, Inc.
  
$
621
     $
246
    
$
(1,018
)
   $
346
  
                                 
Denominator:
                                
Weighted average shares used in basic net income per share calculation
  
 
20,654
      
20,602
    
 
20,650
      
20,633
  
                                 
Weighted average shares used in diluted net income per share calculation
  
 
21,320
      
21,320
    
 
20,650
      
21,331
  
                                 
Basic and diluted net income (loss) per common share
  
$
0.03
     $
0.01
    
$
(0.05
)
   $
0.02