Document and Entity Information Document - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Mar. 09, 2022	Jul. 02, 2021
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Trading Symbol	CTG
Entity Registrant Name	COMPUTER TASK GROUP, INCORPORATED
Entity Central Index Key	0000023111
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Shell Company	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Public Float			$ 132.1
Entity Common Stock, Shares Outstanding		15,341,048
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common Stock, par value $0.01 per share
Security Exchange Name	NASDAQ
Entity File Number	1-9410
Entity Incorporation, State or Country Code	NY
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
Document Annual Report	true
Document Transition Report	false
Documents Incorporated by Reference	None.
Auditor Name	Grant Thornton LLP
Auditor Firm ID	248
Auditor Location	Cleveland, OH, United States