Document and Entity Information Document - shares	6 Months Ended
	Jul. 02, 2021	Aug. 03, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jul. 02, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Trading Symbol	CTG
Entity Registrant Name	COMPUTER TASK GROUP, INCORPORATED
Entity Central Index Key	0000023111
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
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 Incorporation, State or Country Code	NY
Entity Address, Postal Zip Code	14226
City Area Code	716
Local Phone Number	882-8000
Title of 12(b) Security	Common Stock, par value $0.01 per share
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		15,328,032
Entity Interactive Data Current	Yes
Document Quarterly Report	true
Document Transition Report	false