Note 14 - Incentive Compensation Plans (Details Textual) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Supplemental Employee Retirement Plan [Member]
Supplemental Executive Retirement Plan, Employer Matching Contribution, Percentage		100.00%
Asset Retirement Obligation, Legally Restricted Assets, Fair Value	$ 339,000	$ 330,000
Deferred Compensation Liability, Classified, Noncurrent, Total	$ 341,000	$ 332,000
Incentive Compensation Plan [Member]
Maximum Percentage of Bonus Under Incentive Compensation PLan	18.00%
Minimum Quarterly Income From Operations	$ 500,000
Percentage of Bonus Under Incentive Compensation Plan	18.00%	18.00%
Incentive Compensation Expense Annual	$ 0	$ 109,500

The Compensation expense recognized during the period pertaining to the incentive compensation bonus plan.

No definition available.

Name:	relv_IncentiveCompensationExpenseAnnual
Namespace Prefix:	relv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This element represents that, the maximum percentage of the entities Income from Operations payable as bonus under incentive compensation plan.

+ References

No definition available.

+ Details

Name:	relv_MaximumPercentageOfBonusUnderIncentiveCompensationPlan
Namespace Prefix:	relv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The minimum quarterly income to be achieved under the plan.

+ References

No definition available.

+ Details

Name:	relv_MinimumQuarterlyIncomeFromOperations
Namespace Prefix:	relv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This element represents that, the percentage of the entities Income from Operations payable as bonus under incentive compensation plan.

+ References

No definition available.

+ Details

Name:	relv_PercentageOfBonusUnderIncentiveCompensationPlan
Namespace Prefix:	relv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of employees' gross pay for which the employer contributes a discretionary matching contribution to a supplemental executive retirement plan.

+ References

No definition available.

+ Details

Name:	relv_SupplementalExecutiveRetirementPlanEmployerMatchingContributionPercentage
Namespace Prefix:	relv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying amount of an asset that is legally restricted for purposes of settling an asset retirement obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

+ Details

Name:	us-gaap_AssetRetirementObligationLegallyRestrictedAssetsFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=relv_IncentiveCompensationPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: