Cybersecurity Risk Management and Strategy Disclosure	12 Months Ended
Dec. 28, 2024
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	Risk Management and Strategy We recognize the critical importance of developing, implementing, and maintaining robust cybersecurity measures to safeguard our information systems and protect the confidentiality, integrity, and availability of our intellectual property and data. We maintain policies and procedures designed to allow management to assess, identify, and manage material risks from cybersecurity threats. We integrate our cybersecurity policies and procedures into our overall enterprise risk management program, which is implemented by management and overseen by the Board of Directors (the “Board”) through its Audit Committee. We utilize the Center for Internet Security (“CIS”) Critical Security Controls as a framework for managing our cybersecurity program. The CIS framework outlines 18 critical control areas relating to organizational security and provides effective methodologies, guidelines, and industry standard best practices to develop and manage a comprehensive cybersecurity program. Additionally, we align our controls to various international security certifications and standards and have adopted best practices from industry leading frameworks. Our cybersecurity program includes policies and procedures relating to encryption, data loss prevention technology, authentication technology, access control, anti-malware software, third-party risk monitoring, insider risk management and identity management. We engage third-party services to conduct evaluations of our security controls, whether through penetration testing, independent audits, or consulting on best practices to address new challenges. These evaluations include testing both the design and operational effectiveness of security controls. We also regularly obtain system and organization control (“SOC”) reports from our service providers (“SOC 2”). Members of our corporate information security organization receive information exchanges from their professional networks and attend training, webinars, and conferences to stay up to date on both trends and system-specific updates. In addition, all Cohu employees are required to complete continuous security awareness training including annual training, weekly testing and frequent notifications regarding updates on trends or types of attacks, each of which are designed to promote a company-wide culture of cybersecurity risk awareness and management. In the last three fiscal years, we have not experienced any material cybersecurity incidents and the expenses we have incurred from cybersecurity incidents, including penalties and settlements, were immaterial. As a result, we do not believe that risks from cybersecurity threats, including as a result of any previous cybersecurity incidents, have materially affected us, our results of operations or financial condition. Notwithstanding the measures we take to assess, identify, and manage cybersecurity risks, we may not be successful in preventing or mitigating a cybersecurity incident that could have a material adverse effect on us and we may experience such incidents in the future and the scope and impact of any such future incidents cannot be predicted. For a discussion of how risks from identified cybersecurity threats, including as a result of any previous cybersecurity incidents, may materially affect or are reasonably likely to materially affect us, including our business strategy, results of operations or financial condition, see the risk factor entitled “Our business and operations could suffer in the event of cybersecurity breaches within our operational systems or products”.
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	We utilize the Center for Internet Security (“CIS”) Critical Security Controls as a framework for managing our cybersecurity program. The CIS framework outlines 18 critical control areas relating to organizational security and provides effective methodologies, guidelines, and industry standard best practices to develop and manage a comprehensive cybersecurity program. Additionally, we align our controls to various international security certifications and standards and have adopted best practices from industry leading frameworks. Our cybersecurity program includes policies and procedures relating to encryption, data loss prevention technology, authentication technology, access control, anti-malware software, third-party risk monitoring, insider risk management and identity management. We engage third-party services to conduct evaluations of our security controls, whether through penetration testing, independent audits, or consulting on best practices to address new challenges. These evaluations include testing both the design and operational effectiveness of security controls. We also regularly obtain system and organization control (“SOC”) reports from our service providers (“SOC 2”). Members of our corporate information security organization receive information exchanges from their professional networks and attend training, webinars, and conferences to stay up to date on both trends and system-specific updates. In addition, all Cohu employees are required to complete continuous security awareness training including annual training, weekly testing and frequent notifications regarding updates on trends or types of attacks, each of which are designed to promote a company-wide culture of cybersecurity risk awareness and management.
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]	false
Cybersecurity Risk Board of Directors Oversight [Text Block]	Governance Role of the Board of Directors and the Audit Committee As part of the Board’s role in overseeing our enterprise risk management program, which includes our cybersecurity risk management, the Board is responsible for exercising oversight of management’s identification and management of, and planning for, material cybersecurity risks that may reasonably be expected to have an adverse effect on us. While the full Board has overall responsibility for risk oversight, the Board has delegated oversight responsibility related to risks from cybersecurity threats to the Audit Committee. The Audit Committee is informed of the Company’s cybersecurity risk management and receives an overview of its cybersecurity program from management at least annually, which typically includes a table top simulation and covers topics including, among others, recent cybersecurity risk landscape and trends, data security posture, results from third-party assessments, training and vulnerability testing, our incident response plan, material cybersecurity risks, whether developing or actual, as well as the steps management has taken to respond to such risks, emerging cybersecurity regulations, technologies and best practices. This review helps in identifying areas for improvement and in aligning cybersecurity efforts with the overall risk management framework and promotion of our business objective and operational needs. In addition to our scheduled meetings, the Audit Committee maintains an ongoing dialogue with management, including regarding emerging or potential cybersecurity risks. Role of Management Our corporate information security organization, led by our Chief Information Security Officer (“CISO”), is responsible for our overall information security strategy, policy, security engineering, operations and cyber threat detection and response. Our CISO has over 35 years of experience in various roles in information technology and information security, including serving as SVP and CIO or VP and CIO at various defense, aerospace and semiconductor supplier companies. He holds a bachelor’s degree in Computer Science, an MBA, and holds several relevant certifications, including Information Technology Infrastructure Library (ITIL) Certification. The corporate information security organization manages and regularly enhances our enterprise security structure with the goal of preventing cybersecurity incidents to the extent feasible, while simultaneously increasing our system resilience in an effort to minimize the business impact should an incident occur. Central to this organization is our cybersecurity incident response team (“CIRT”), which is responsible for the protection, detection and response capabilities used in the defense of Cohu’s data and enterprise computing networks. In the event of an incident, we intend to follow our incident response plan, which outlines the steps to be followed from incident detection to mitigation, mitigation or eradication, recovery and notification, including notifying key functional areas, as well as the CISO, General Counsel, CEO, Chairperson of the Board and Chairperson of the Audit Committee and other members of the Board, as appropriate.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	As part of the Board’s role in overseeing our enterprise risk management program, which includes our cybersecurity risk management, the Board is responsible for exercising oversight of management’s identification and management of, and planning for, material cybersecurity risks that may reasonably be expected to have an adverse effect on us. While the full Board has overall responsibility for risk oversight, the Board has delegated oversight responsibility related to risks from cybersecurity threats to the Audit Committee. The Audit Committee is informed of the Company’s cybersecurity risk management and receives an overview of its cybersecurity program from management at least annually, which typically includes a table top simulation and covers topics including, among others, recent cybersecurity risk landscape and trends, data security posture, results from third-party assessments, training and vulnerability testing, our incident response plan, material cybersecurity risks, whether developing or actual, as well as the steps management has taken to respond to such risks, emerging cybersecurity regulations, technologies and best practices. This review helps in identifying areas for improvement and in aligning cybersecurity efforts with the overall risk management framework and promotion of our business objective and operational needs. In addition to our scheduled meetings, the Audit Committee maintains an ongoing dialogue with management, including regarding emerging or potential cybersecurity risks.
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	As part of the Board’s role in overseeing our enterprise risk management program, which includes our cybersecurity risk management, the Board is responsible for exercising oversight of management’s identification and management of, and planning for, material cybersecurity risks that may reasonably be expected to have an adverse effect on us. While the full Board has overall responsibility for risk oversight, the Board has delegated oversight responsibility related to risks from cybersecurity threats to the Audit Committee. The Audit Committee is informed of the Company’s cybersecurity risk management and receives an overview of its cybersecurity program from management at least annually, which typically includes a table top simulation and covers topics including, among others, recent cybersecurity risk landscape and trends, data security posture, results from third-party assessments, training and vulnerability testing, our incident response plan, material cybersecurity risks, whether developing or actual, as well as the steps management has taken to respond to such risks, emerging cybersecurity regulations, technologies and best practices. This review helps in identifying areas for improvement and in aligning cybersecurity efforts with the overall risk management framework and promotion of our business objective and operational needs. In addition to our scheduled meetings, the Audit Committee maintains an ongoing dialogue with management, including regarding emerging or potential cybersecurity risks.
Cybersecurity Risk Role of Management [Text Block]	Our corporate information security organization, led by our Chief Information Security Officer (“CISO”), is responsible for our overall information security strategy, policy, security engineering, operations and cyber threat detection and response.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	Our CISO has over 35 years of experience in various roles in information technology and information security, including serving as SVP and CIO or VP and CIO at various defense, aerospace and semiconductor supplier companies. He holds a bachelor’s degree in Computer Science, an MBA, and holds several relevant certifications, including Information Technology Infrastructure Library (ITIL) Certification. The corporate information security organization manages and regularly enhances our enterprise security structure with the goal of preventing cybersecurity incidents to the extent feasible, while simultaneously increasing our system resilience in an effort to minimize the business impact should an incident occur. Central to this organization is our cybersecurity incident response team (“CIRT”), which is responsible for the protection, detection and response capabilities used in the defense of Cohu’s data and enterprise computing networks. In the event of an incident, we intend to follow our incident response plan, which outlines the steps to be followed from incident detection to mitigation, mitigation or eradication, recovery and notification, including notifying key functional areas, as well as the CISO, General Counsel, CEO, Chairperson of the Board and Chairperson of the Audit Committee and other members of the Board, as appropriate.
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	Our CISO has over 35 years of experience in various roles in information technology and information security, including serving as SVP and CIO or VP and CIO at various defense, aerospace and semiconductor supplier companies. He holds a bachelor’s degree in Computer Science, an MBA, and holds several relevant certifications, including Information Technology Infrastructure Library (ITIL) Certification. The corporate information security organization manages and regularly enhances our enterprise security structure with the goal of preventing cybersecurity incidents to the extent feasible, while simultaneously increasing our system resilience in an effort to minimize the business impact should an incident occur. Central to this organization is our cybersecurity incident response team (“CIRT”), which is responsible for the protection, detection and response capabilities used in the defense of Cohu’s data and enterprise computing networks. In the event of an incident, we intend to follow our incident response plan, which outlines the steps to be followed from incident detection to mitigation, mitigation or eradication, recovery and notification, including notifying key functional areas, as well as the CISO, General Counsel, CEO, Chairperson of the Board and Chairperson of the Audit Committee and other members of the Board, as appropriate.
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	As part of the Board’s role in overseeing our enterprise risk management program, which includes our cybersecurity risk management, the Board is responsible for exercising oversight of management’s identification and management of, and planning for, material cybersecurity risks that may reasonably be expected to have an adverse effect on us. While the full Board has overall responsibility for risk oversight, the Board has delegated oversight responsibility related to risks from cybersecurity threats to the Audit Committee. The Audit Committee is informed of the Company’s cybersecurity risk management and receives an overview of its cybersecurity program from management at least annually, which typically includes a table top simulation and covers topics including, among others, recent cybersecurity risk landscape and trends, data security posture, results from third-party assessments, training and vulnerability testing, our incident response plan, material cybersecurity risks, whether developing or actual, as well as the steps management has taken to respond to such risks, emerging cybersecurity regulations, technologies and best practices. This review helps in identifying areas for improvement and in aligning cybersecurity efforts with the overall risk management framework and promotion of our business objective and operational needs. In addition to our scheduled meetings, the Audit Committee maintains an ongoing dialogue with management, including regarding emerging or potential cybersecurity risks.
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

Cybersecurity Risk Management and Strategy Disclosure

12 Months Ended

Dec. 28, 2024

Cybersecurity Risk Management, Strategy, and Governance [Line Items]

Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]

Risk Management and Strategy

We recognize the critical importance of developing, implementing, and maintaining robust cybersecurity measures to safeguard our information systems and protect the confidentiality, integrity, and availability of our intellectual property and data. We maintain policies and procedures designed to allow management to assess, identify, and manage material risks from cybersecurity threats. We integrate our cybersecurity policies and procedures into our overall enterprise risk management program, which is implemented by management and overseen by the Board of Directors (the “Board”) through its Audit Committee.

We utilize the Center for Internet Security (“CIS”) Critical Security Controls as a framework for managing our cybersecurity program. The CIS framework outlines 18 critical control areas relating to organizational security and provides effective methodologies, guidelines, and industry standard best practices to develop and manage a comprehensive cybersecurity program. Additionally, we align our controls to various international security certifications and standards and have adopted best practices from industry leading frameworks. Our cybersecurity program includes policies and procedures relating to encryption, data loss prevention technology, authentication technology, access control, anti-malware software, third-party risk monitoring, insider risk management and identity management. We engage third-party services to conduct evaluations of our security controls, whether through penetration testing, independent audits, or consulting on best practices to address new challenges. These evaluations include testing both the design and operational effectiveness of security controls. We also regularly obtain system and organization control (“SOC”) reports from our service providers (“SOC 2”). Members of our corporate information security organization receive information exchanges from their professional networks and attend training, webinars, and conferences to stay up to date on both trends and system-specific updates. In addition, all Cohu employees are required to complete continuous security awareness training including annual training, weekly testing and frequent notifications regarding updates on trends or types of attacks, each of which are designed to promote a company-wide culture of cybersecurity risk awareness and management.

In the last three fiscal years, we have not experienced any material cybersecurity incidents and the expenses we have incurred from cybersecurity incidents, including penalties and settlements, were immaterial. As a result, we do not believe that risks from cybersecurity threats, including as a result of any previous cybersecurity incidents, have materially affected us, our results of operations or financial condition. Notwithstanding the measures we take to assess, identify, and manage cybersecurity risks, we may not be successful in preventing or mitigating a cybersecurity incident that could have a material adverse effect on us and we may experience such incidents in the future and the scope and impact of any such future incidents cannot be predicted. For a discussion of how risks from identified cybersecurity threats, including as a result of any previous cybersecurity incidents, may materially affect or are reasonably likely to materially affect us, including our business strategy, results of operations or financial condition, see the risk factor entitled “Our business and operations could suffer in the event of cybersecurity breaches within our operational systems or products”.

Cybersecurity Risk Management Processes Integrated [Flag]

true

Cybersecurity Risk Management Processes Integrated [Text Block]

Cybersecurity Risk Management Third Party Engaged [Flag]

true

Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]

true

Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]

false

Cybersecurity Risk Board of Directors Oversight [Text Block]

Governance

Role of the Board of Directors and the Audit Committee

As part of the Board’s role in overseeing our enterprise risk management program, which includes our cybersecurity risk management, the Board is responsible for exercising oversight of management’s identification and management of, and planning for, material cybersecurity risks that may reasonably be expected to have an adverse effect on us. While the full Board has overall responsibility for risk oversight, the Board has delegated oversight responsibility related to risks from cybersecurity threats to the Audit Committee. The Audit Committee is informed of the Company’s cybersecurity risk management and receives an overview of its cybersecurity program from management at least annually, which typically includes a table top simulation and covers topics including, among others, recent cybersecurity risk landscape and trends, data security posture, results from third-party assessments, training and vulnerability testing, our incident response plan, material cybersecurity risks, whether developing or actual, as well as the steps management has taken to respond to such risks, emerging cybersecurity regulations, technologies and best practices. This review helps in identifying areas for improvement and in aligning cybersecurity efforts with the overall risk management framework and promotion of our business objective and operational needs. In addition to our scheduled meetings, the Audit Committee maintains an ongoing dialogue with management, including regarding emerging or potential cybersecurity risks.

Role of Management

Our corporate information security organization, led by our Chief Information Security Officer (“CISO”), is responsible for our overall information security strategy, policy, security engineering, operations and cyber threat detection and response.

Our CISO has over 35 years of experience in various roles in information technology and information security, including serving as SVP and CIO or VP and CIO at various defense, aerospace and semiconductor supplier companies. He holds a bachelor’s degree in Computer Science, an MBA, and holds several relevant certifications, including Information Technology Infrastructure Library (ITIL) Certification. The corporate information security organization manages and regularly enhances our enterprise security structure with the goal of preventing cybersecurity incidents to the extent feasible, while simultaneously increasing our system resilience in an effort to minimize the business impact should an incident occur. Central to this organization is our cybersecurity incident response team (“CIRT”), which is responsible for the protection, detection and response capabilities used in the defense of Cohu’s data and enterprise computing networks. In the event of an incident, we intend to follow our incident response plan, which outlines the steps to be followed from incident detection to mitigation, mitigation or eradication, recovery and notification, including notifying key functional areas, as well as the CISO, General Counsel, CEO, Chairperson of the Board and Chairperson of the Audit Committee and other members of the Board, as appropriate.

Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]

Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]

Cybersecurity Risk Role of Management [Text Block]

Cybersecurity Risk Management Positions or Committees Responsible [Flag]

true

Cybersecurity Risk Management Positions or Committees Responsible [Text Block]

Cybersecurity Risk Management Expertise of Management Responsible [Text Block]

Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]

Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]

true