OTHER LONG-TERM LIABILITIES (Details) - USD ($)	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
OTHER LONG-TERM LIABILITIES
Technology Investment Agreement (TIA)	$ 75,459,612	$ 68,955,664
Stock repurchase		1,040,666
Total	75,459,612	$ 69,996,330
Amount of final installment payment classified as Other accrued liabilities	$ 1,101,110

Amount of annual installment payment for stock repurchase of preferred shares in a private transaction.

No definition available.

Name:	rvp_AnnualInstallmentPaymentForStockRepurchaseOfPreferredSharesInPrivateTransaction
Namespace Prefix:	rvp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of Long-term deferred liability relating to preferred stock redemption.

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- Definition

Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_OtherLiabilitiesNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant