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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Intangible assets - correction of errors (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Intangible assets - correction of errors
Increase in Accumulated deficit	$ (31,963,487)	$ (28,268,580)
Error due to patent costs being capitalized rather than expensed
Intangible assets - correction of errors
Credit to intangible and other assets		(246,779)
Increase in Accumulated deficit		$ (246,779)

X

- Definition

This element represents sum of the carrying amounts of all intangible assets as of the balance sheet date, net of accumulated amortization and impairment charges and also of noncurrent assets not separately disclosed in the balance sheet due to materiality considerations.

+ References

No definition available.

+ Details

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

X

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

X

- Definition

The cumulative amount of the reporting entity's undistributed earnings or deficit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.31(a)(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

+ Details

Name:	us-gaap_RetainedEarningsAccumulatedDeficit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis=rvp_ErrorDueToPatentCostsBeingCapitalizedRatherThanExpensedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: