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Document And Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Mar. 22, 2019
Jun. 30, 2018
Document Information [Line Items]      
Entity Registrant Name SPAR GROUP INC    
Entity Central Index Key 0001004989    
Trading Symbol sgrp    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer No    
Entity Emerging Growth Company false    
Entity Small Business true    
Entity Common Stock, Shares Outstanding (in shares)   20,776,588  
Entity Public Float     $ 7.4
Entity Shell Company false    
Document Type 10-K/A    
Document Period End Date Dec. 31, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Amendment Flag true    
Amendment Description This Amendment is being filed to replace the incorrect version of our Annual Report on Form 10-K for 2018 that was filed on April 15, 2019. This First Amendment on Form 10-K/A adds two exhibits and certain exhibit links inadvertently omitted from our April 15th and corrects several typographical errors.