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SUBSEQUENT EVENTS (Details) - Subsequent Events - USD ($)	May 13, 2021	Apr. 30, 2021
SUBSEQUENT EVENTS
Preliminary notice, notice of intent to extend Government contract, purchase price		$ 23,500,000
Paycheck Protection Program, CARES Act
SUBSEQUENT EVENTS
Loan amount forgiveness, CARES Act	$ 1,363,000

X

- Definition

Represents the preliminary notice, notice of intent to extend Government contract, purchase price

+ References

No definition available.

+ Details

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

X

- Definition

Decrease for amounts of indebtedness forgiven by the holder of the debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: