OTHER LONG-TERM LIABILITIES (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
OTHER LONG-TERM LIABILITIES
Technology Investment Agreement (TIA)	$ 74,439,649	$ 75,459,612

The amount of Long-term deferred liability relating to technology investment agreement.

No definition available.

Name:	rvp_LongTermDeferredLiabilityTechnologyInvestmentAgreement
Namespace Prefix:	rvp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant