| Document and Entity Information | Dec. 08, 2023 |
| Cover [Abstract] | |
| Entity Registrant Name | COMPUTER TASK GROUP INC |
| Amendment Flag | false |
| Entity Central Index Key | 0000023111 |
| Current Fiscal Year End Date | --12-31 |
| Document Type | 8-K |
| Document Period End Date | Dec. 08, 2023 |
| Entity Incorporation State Country Code | NY |
| Entity File Number | 1-9410 |
| Entity Tax Identification Number | 16-0912632 |
| Entity Address, Address Line One | 300 Corporate Parkway |
| Entity Address, Address Line Two | Suite 214N |
| Entity Address, City or Town | Amherst |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 14226 |
| City Area Code | 716 |
| Local Phone Number | 882-8000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $0.01 per share |
| Trading Symbol | CTG |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
