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Note 18 - Severance, Professional Fees, and Other Charges (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2019 | Sep. 29, 2018 | Sep. 28, 2019 | Sep. 29, 2018
Severance, Professional Fees and Other Charges |  |  |  | $ 1,371
Former Chief Executive Officer [Member] | Severance Accrued and Related Payroll Taxes, Continuation of Certain Benefits and Professional Fees [Member] |  |  |  |
Severance, Professional Fees and Other Charges |  |  |  | 900
Former Chief Executive Officer [Member] | Severance, Legal Fees Related to Acquisition, and Other Legal Miscellaneous Charges [Member] |  |  |  |
Severance, Professional Fees and Other Charges |  |  |  | $ 500

X
- Definition The amount of expense related to severance, professional fees and other charges. + References No definition available. + Details
Name: | rcmt_SeveranceProfessionalFeesAndOtherCharges
Namespace Prefix: | rcmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | srt_TitleOfIndividualAxis=rcmt_FormerChiefExecutiveOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_NatureOfExpenseAxis=rcmt_SeveranceAccruedAndRelatedPayrollTaxesContinuationOfCertainBenefitsAndProfessionalFeesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_NatureOfExpenseAxis=rcmt_SeveranceLegalFeesRelatedToAcquisitionAndOtherLegalMiscellaneousChargesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |