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TECHNOLOGY INVESTMENT AGREEMENT (Details) | May 31, 2021 item | Jul. 01, 2020 | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
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TECHNOLOGY INVESTMENT AGREEMENT |  |  |  |
Technology investment agreement term |  | 10 years |  |
Number of assembly lines added | item | 2 |  |  |
Long-term deferred liability - TIA | $ |  |  | $ 69,773,538 | $ 75,459,612

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- Definition The amount of Long-term deferred liability relating to technology investment agreement. + References No definition available. + Details
Name: | rvp_LongTermDeferredLiabilityTechnologyInvestmentAgreement
Namespace Prefix: | rvp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The number of assembly lines provided under the agreement. + References No definition available. + Details
Name: | rvp_NumberOfAssemblyLines
Namespace Prefix: | rvp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | rvp_TechnologyInvestmentAgreementDisclosureAbstract
Namespace Prefix: | rvp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Technology investment agreement, term, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | rvp_TechnologyInvestmentAgreementTerm
Namespace Prefix: | rvp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration