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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventories (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Inventories |  |
Lower of cost or net realizable value inventory adjustment | $ 9,500 |
VanishPoint 3mL and EasyPoint needle |  |
Inventories |  |
Lower of cost or net realizable value inventory adjustment |  | $ 101,000

X
- Definition Reflects the amount charged against earnings to adjust inventory to the lower of cost or net realizable value. + References No definition available. + Details
Name: | rvp_InventoryLowerOfCostOrNetRealizableValueAdjustment
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_InventoryLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_ProductOrServiceAxis=rvp_VanishPointAndEasyPointNeedlesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |