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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Self-insured employee benefit costs (Details) | 9 Months Ended
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Sep. 30, 2022 USD ($)
Minimum |
Self-insured employee benefit costs |
Additional insurance coverage | $ 100,000
Maximum |
Self-insured employee benefit costs |
Additional insurance coverage | $ 1,700,000

X
- Definition Amount at the high end of insurance coverage. + References No definition available. + Details
Name: | rvp_AdditionalInsuranceCoverage
Namespace Prefix: | rvp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpenseLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |