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Note 18 - Commitments (Details Textual) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2021 | Dec. 31, 2022 | Jan. 01, 2022 | Jan. 02, 2021
Operating Lease, Impairment Loss |  | $ 0 | $ 0 | $ 2,231
COVID-19 [Member] |  |  |  |
Operating Lease, Impairment Loss | $ 1,900 |  |  |
Operating Lease, Right-of-use Asset, Write-off | $ 300 |  |  |

X
- Definition The amount of right of use asset of operating lease written off during the period. + References No definition available. + Details
Name: | rcmt_OperatingLeaseRightofuseAssetWriteoff
Namespace Prefix: | rcmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of loss from impairment of right-of-use asset from operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 25 -Paragraph 6 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=123399704&loc=SL77918431-209957 + Details
Name: | us-gaap_OperatingLeaseImpairmentLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_UnusualOrInfrequentItemAxis=rcmt_COVID19Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |