Note 8 - Commitments and Contingencies (Details Textual)	9 Months Ended
Sep. 30, 2021 USD ($)
Corporate Office Lease [Member]
Lessee, Operating Lease, Term of Contract (Month)	12 months
Lessee, Operating Lease, Monthly Lease Payment	$ 1,200
Lessee, Operating Lease, Renewal Term (Month)	12 months
Minimum [Member]
General Product Liability Insurance	$ 5,000,000

Represents the amount of general product liability insurance.

No definition available.

Name:	rvph_GeneralProductLiabilityInsurance
Namespace Prefix:	rvph_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Monthly lease payment for lessee's operating lease.

+ References

No definition available.

+ Details

Name:	rvph_LesseeOperatingLeaseMonthlyLeasePayment
Namespace Prefix:	rvph_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980

+ Details

Name:	us-gaap_LesseeOperatingLeaseRenewalTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_LeaseContractualTermAxis=rvph_CorporateOfficeLeaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: