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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Self-insured employee benefit costs (Details)	Sep. 30, 2025 USD ($)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Self-insured threshold for individual claims	$ 110,000
Self-insured threshold for total plain claims for the year	$ 1,400,000

X

- Definition

The threshold amount of self-insurance for health insurance benefit liability for total plan claims for the year assumed by the Company.

+ References

No definition available.

+ Details

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Period Type:	instant

X

- Definition

The threshold minimum amount of self-insurance for individual claims health insurance benefit liability assumed by the Company.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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