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Note 5 - Property and Equipment (Details Textual) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 28, 2020 | Mar. 30, 2019
Annual Depreciation Rate | 20.00% |
Write Off of Fully Depreciated Property and Equipment | $ 960 | $ 1,620
Depreciation, Total | $ 255 | $ 315

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- 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

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- 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

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- 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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
Name: | us-gaap_Depreciation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration