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Note 4 - Accounts Receivable, Transit Accounts Receivable and Transit Accounts Payable (Details Textual) - Total Accounts Receivable and Transit Accounts Receivable [Member] - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Accounts Receivable, before Allowance for Credit Loss, Current	$ 9.5	$ 3.3
Accounts Payable, Current	38.4	9.8
Accounts Payable, Net	$ 28.9	$ 6.5

X

- Definition

Represents the amount of accounts payable as of the specified date, net of accounts receivable.

+ References

No definition available.

+ Details

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

X

- Definition

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
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-Publisher FASB
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+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
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-Topic 310
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-Name Accounting Standards Codification
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-Publisher FASB
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+ Details

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Balance Type:	debit
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: