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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

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

- 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: