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Note 5 - Property and Equipment (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019	Jun. 27, 2020
Annual Depreciation Rate					20.00%
Write Off of Fully Depreciated Property and Equipment			$ 1,529	$ 1,803
Depreciation, Total	$ 292	$ 304	$ 793	$ 944

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://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