Note 6 - Acquisitions - Maximum Deferred Consideration Payments (Details) $ in Thousands	Sep. 28, 2019 USD ($)
December 28, 2019 (after September 28, 2019)
January 2, 2021	388
January 1, 2022	1,754
December 31, 2022	919
Estimated future contingent consideration payments	$ 3,061

Represents estimated future contingent consideration payments.

No definition available.

Name:	rcmt_EstimatedFutureContingentConsiderationPayments
Namespace Prefix:	rcmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents estimated future contingent consideration payments remainder of fiscal year.

No definition available.

Name:	rcmt_EstimatedFutureContingentConsiderationPaymentsRemainderOfFiscalYear
Namespace Prefix:	rcmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents estimated future contingent consideration payments in year four.

No definition available.

Name:	rcmt_EstimatedFutureContingentConsiderationPaymentsYearFour
Namespace Prefix:	rcmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents estimated future contingent consideration payments in year three.

No definition available.

Name:	rcmt_EstimatedFutureContingentConsiderationPaymentsYearThree
Namespace Prefix:	rcmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents estimated future contingent consideration payments in year two.

No definition available.

Name:	rcmt_EstimatedFutureContingentConsiderationPaymentsYearTwo
Namespace Prefix:	rcmt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant