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Note 5 - Property and Equipment (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 30, 2017 | Dec. 31, 2016
Annual Depreciation Rate | 20.00% |
Write Off of Fully Depreciated Property and Equipment | $ 458 | $ 2,705
Depreciation | $ 1,691 | $ 1,489

X
- Definition Represents the annual depreciation rate. + References No definition available. + Details
Name: | rcmt_AnnualDepreciationRate
Namespace Prefix: | rcmt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Write off of fully depreciated property and equipmen + References No definition available. + Details
Name: | rcmt_WriteOffOfFullyDepreciatedPropertyAndEquipment
Namespace Prefix: | rcmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
Name: | us-gaap_Depreciation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration