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Note 17 - Severance, Professional Fees and Other Charges (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Severance, Professional Fees and Other Charges	$ 1,371		$ 1,371
Transactional Advisory Fees, Legal Fees, and Search Fees [Member]
Severance, Professional Fees and Other Charges	500
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

X

- Definition

The amount of expense related to severance, professional fees and other charges.

+ References

No definition available.

+ Details

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Namespace Prefix:	rcmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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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: