Document And Entity Information - shares	6 Months Ended
	Jun. 26, 2021	Aug. 06, 2021
Document Information [Line Items]
Entity Central Index Key	0000814676
Entity Registrant Name	CPS TECHNOLOGIES CORP/DE/
Amendment Flag	true
Current Fiscal Year End Date	--12-25
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2021
Document Type	10-Q/A
Document Quarterly Report	true
Document Period End Date	Jun. 26, 2021
Document Transition Report	false
Entity File Number	0-16088
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	04-2832509
Entity Address, Address Line One	111 South Worcester Street
Entity Address, City or Town	Norton
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02766-2102
City Area Code	508
Local Phone Number	222-0614
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	CPSH
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		14,322,617
Amendment Description	The sole purpose of this Amendment No. 1 to the Quarterly Report on Form 10-Q (the “Form 10-Q”) of CPS Technologies Corp. for the quarterly period ended June 26, 2021, filed with the Securities and Exchange Commission on August 13, 2021, is to furnish Exhibit 101 to the Form 10-Q in accordance with Rule 405 of Regulation S-T. Exhibit 101 to the Form 10-Q provides the consolidated financial statements and related notes from the Form 10-Q formatted in iXBRL (Inline eXtensible Business Reporting Language).   No other changes have been made to the Form 10-Q. This Amendment No. 1 to the Form 10-Q speaks as of the original filing date of the Form 10-Q, does not reflect events that may have occurred subsequent to the original filing date, and does not modify or update in any way disclosures made in the original Form 10-Q.   Pursuant to Rule 406 of Regulation S-T, the interactive data files on Exhibit 101 hereto are deemed not filed or part of a registration statement or prospectus for purposes of Sections 11 or 12 of the Securities Act of 1933, as amended, are deemed not filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and otherwise are not subject to liability under those sections.