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OTHER LONG-TERM LIABILITIES- Additional information (Details)	3 Months Ended
	Mar. 31, 2022 USD ($)
OTHER LONG-TERM LIABILITIES
Final installment	$ 1,101,110

X

- Definition

purchase price is payable.

+ References

No definition available.

+ Details

Name:	rvp_OtherLongTermLiabilitiesPurchasePricePayable
Namespace Prefix:	rvp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_OtherLiabilitiesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration