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RELATED PARTY TRANSACTIONS (Details) - BML Investment Partners, L.P. - Related Party Transaction, Share Repurchase shares in Millions | Dec. 26, 2022 $ / shares shares
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RELATED PARTY TRANSACTIONS |
Number of shares authorized for repurchase | shares | 3
Share repurchase, price per share | $ / shares | $ 1.60
Equity interest in the Company held by a related party | 10.00%

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- Definition The equity interest in the consolidated entity held by a related party. + References No definition available. + Details
Name: | rvp_RelatedPartyOwnershipPercentage
Namespace Prefix: | rvp_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The purchase price per share for the purchase of the targeted number of shares in a share repurchase agreement. + References No definition available. + Details
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Namespace Prefix: | rvp_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_InvestorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionAxis=rvp_RelatedPartyTransactionShareRepurchaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |