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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventories (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
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

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: