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OTHER LONG-TERM LIABILITIES- Additional information (Details) - USD ($)	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
OTHER LONG-TERM LIABILITIES
Current portion - preferred stock repurchase	$ 1,071,637	$ 1,101,110	$ 1,098,282

X

- Definition

It represents information about current portion of preferred stock repurchase.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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