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Note 3 - Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
 
   
March
31,
 
   
2021
   
2020
 
Numerator:
               
Net income attributable to SPAR Group, Inc.
  $
917
    $
298
 
                 
Denominator:
               
Shares used in basic net income per share calculation
 
 
21,188
     
21,105
 
Effect of diluted securities:
               
Stock options and unvested restricted shares
 
 
393
     
122
 
Shares used in diluted net income per share calculations
 
 
21,581
     
21,228
 
                 
Basic and diluted net income per common share:
  $
0.04
    $
0.01