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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts receivable (Details)	12 Months Ended
	Dec. 31, 2020 customer
Accounts receivable
Number of products consigned to customers	0

X

- Definition

Represents the number of products which have been consigned to the customers.

+ References

No definition available.

+ Details

Name:	rvp_NumberOfProductsConsignedToCustomers
Namespace Prefix:	rvp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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