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HELD-TO-MATURITY DEBT SECURITIES (Details)	Dec. 31, 2018 USD ($)
HELD-TO-MATURITY SECURITIES - CORRECTION OF ERRORS
Reclassification from held to maturity to equity securities	$ 2,986,156
Increase in current assets due to reclassification	$ 1,989,923

X

- Definition

The amount of shares increase in current assets due to reclassification.

+ References

No definition available.

+ Details

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X

- Definition

The amount of shares reclassified from held to maturity.

+ References

No definition available.

+ Details

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Namespace Prefix:	rvp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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