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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts receivable (Details) | 12 Months Ended
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Dec. 31, 2020 customer
Accounts receivable |
Number of products consigned to customers | 0

X
- Definition Represents the number of products which have been consigned to the customers. + References No definition available. + Details
Name: | rvp_NumberOfProductsConsignedToCustomers
Namespace Prefix: | rvp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountsReceivableAdditionalDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration