| Document And Entity Information | Aug. 30, 2024 |
| Document Information [Line Items] | |
| Entity, Registrant Name | SPAR Group, Inc. |
| Document, Type | 8-K |
| Document, Period End Date | Aug. 30, 2024 |
| Entity, Incorporation, State or Country Code | DE |
| Entity, File Number | 0-27408 |
| Entity, Tax Identification Number | 33-0684451 |
| Entity, Address, Address Line One | 1910 Opdyke Court |
| Entity, Address, City or Town | Auburn Hills |
| Entity, Address, State or Province | MI |
| Entity, Address, Postal Zip Code | 48326 |
| City Area Code | 248 |
| Local Phone Number | 364-7727 |
| Written Communications | false |
| Soliciting Material | true |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | SGRP |
| Security Exchange Name | NASDAQ |
| Entity, Emerging Growth Company | false |
| Amendment Flag | false |
| Entity, Central Index Key | 0001004989 |
