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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventories (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Inventories |  |  |  |
Inventory Write-down | $ 601,000 | $ 616,740 | $ 1,872 |
VanishPoint 3mL and EasyPoint needle |  |  |  |
Inventories |  |  |  |
Lower of cost or net realizable value inventory adjustment |  | $ 0 |  | $ 0

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
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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
- Definition Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 330 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483080/330-10-50-2 + Details
Name: | us-gaap_InventoryWriteDown
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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