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Note 6 - Acquisitions (Details) - Maximum Deferred Consideration Payments (USD $) In Thousands, unless otherwise specified | Jan. 03, 2015 | Dec. 28, 2013
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Business Acquisition, Contingent Consideration [Line Items] |  |
Estimated contingent consideration payments | $ 1,254 us-gaap_BusinessCombinationContingentConsiderationLiability | $ 930 us-gaap_BusinessCombinationContingentConsiderationLiability
January 3, 2015 [Member] | BGA [Member] |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Estimated contingent consideration payments | 217 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = rcmt_BGAMember / us-gaap_ContingentConsiderationByTypeAxis = rcmt_January32015Member |
January 3, 2015 [Member] | PCI [Member] |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Estimated contingent consideration payments | 262 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = rcmt_PCIMember / us-gaap_ContingentConsiderationByTypeAxis = rcmt_January32015Member |
January 3, 2015 [Member] |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Estimated contingent consideration payments | 479 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_ContingentConsiderationByTypeAxis = rcmt_January32015Member |
December 31, 2016 [Member] | BGA [Member] |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Estimated contingent consideration payments | 271 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = rcmt_BGAMember / us-gaap_ContingentConsiderationByTypeAxis = rcmt_December312016Member |
December 31, 2016 [Member] | PCI [Member] |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Estimated contingent consideration payments | 197 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = rcmt_PCIMember / us-gaap_ContingentConsiderationByTypeAxis = rcmt_December312016Member |
December 31, 2016 [Member] |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Estimated contingent consideration payments | 468 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_ContingentConsiderationByTypeAxis = rcmt_December312016Member |
December 30, 2017 [Member] | PCI [Member] |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Estimated contingent consideration payments | 307 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = rcmt_PCIMember / us-gaap_ContingentConsiderationByTypeAxis = rcmt_December302017Member |
December 30, 2017 [Member] |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Estimated contingent consideration payments | 307 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_ContingentConsiderationByTypeAxis = rcmt_December302017Member |
Estimated Future Payments [Member] | BGA [Member] |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Estimated contingent consideration payments | 488 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = rcmt_BGAMember / us-gaap_ContingentConsiderationByTypeAxis = rcmt_EstimatedFuturePaymentsMember |
Estimated Future Payments [Member] | PCI [Member] |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Estimated contingent consideration payments | 766 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = rcmt_PCIMember / us-gaap_ContingentConsiderationByTypeAxis = rcmt_EstimatedFuturePaymentsMember |
Estimated Future Payments [Member] |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Estimated contingent consideration payments | $ 1,254 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_ContingentConsiderationByTypeAxis = rcmt_EstimatedFuturePaymentsMember |

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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 + Details
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