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STORM DAMAGE AND INSURANCE PROCEEDS (Details)		12 Months Ended
	Mar. 26, 2017 USD ($) building	Dec. 31, 2017 USD ($)
STORM DAMAGE AND INSURANCE PROCEEDS
Number of buildings damaged due to storm | building	2
Insurance proceeds for assessed damages	$ 1,009,960
Deduction of insurance proceeds for assessed damages	$ 5,000
Repair expenses due to the storm damage		$ 538,667
Remaining insurance proceeds		$ 466,293

X

- Definition

Amount of deduction from insurance proceeds for an event or transaction that is unusual in nature or infrequent in occurrence, or both.

+ References

No definition available.

+ Details

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Namespace Prefix:	rvp_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Carrying amount of the insurance proceeds but not subject to utilization and reported as liability.

+ References

No definition available.

+ Details

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

X

- Definition

Represents information pertaining to number of buildings damaged due to storm.

+ References

No definition available.

+ Details

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

X

- Definition

The repair expenses incurred during the period due to the storm damage and funded by insurance proceeds.

+ References

No definition available.

+ Details

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Namespace Prefix:	rvp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- References

No definition available.

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

- Definition

Amount of insurance proceeds for an event or transaction that is unusual in nature or infrequent in occurrence, or both.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64828382&loc=d3e15138-107781

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