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Note 4 - Accounts Receivable and Contract Assets, Net - Activity in Provision for Credit Losses (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jan. 03, 2026 | Dec. 28, 2024
Balance at beginning of year | $ 1,570 | $ 1,600
Increase in provision for credit losses | 906 | 0
Write-offs of receivables to provision for credit losses | (1,247) | (30)
Balance at end of year | $ 1,229 | $ 1,570

X
- Definition Amount of expense related to estimated loss from accounts receivable and contract assets. + References No definition available. + Details
Name: | rcmt_ProvisionForCreditLossAccountsReceivableAndContractAssets
Namespace Prefix: | rcmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of increase (decrease) in allowance for credit loss on accounts receivable and contract assets. + References No definition available. + Details
Name: | rcmt_ProvisionForCreditLossAccountsReceivableAndContractAssetsPeriodIncreaseDecrease
Namespace Prefix: | rcmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + References No definition available. + Details
Name: | rcmt_ProvisionForCreditLossAccountsReceivableAndContractAssetsWriteoff
Namespace Prefix: | rcmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration