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INCOME TAXES (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current tax provision      
Federal   $ 83,470us-gaap_CurrentFederalTaxExpenseBenefit $ 1,785us-gaap_CurrentFederalTaxExpenseBenefit
State 8,177us-gaap_CurrentStateAndLocalTaxExpenseBenefit 7,502us-gaap_CurrentStateAndLocalTaxExpenseBenefit 8,033us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total current provision 8,177us-gaap_CurrentIncomeTaxExpenseBenefit 90,972us-gaap_CurrentIncomeTaxExpenseBenefit 9,818us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred tax provision      
Total income tax provision 8,177us-gaap_IncomeTaxExpenseBenefit 90,972us-gaap_IncomeTaxExpenseBenefit 9,818us-gaap_IncomeTaxExpenseBenefit
Tax benefits attributable to carryback losses for federal tax purposes 9,400,000rvp_IncomeTaxExpenseBenefitAttributableToCarrybackLosses    
Deferred tax assets      
Net operating loss carryforwards 4,704,612us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 3,819,961us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Credit for alternative minimum tax paid 201,773us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 201,773us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax  
Accrued expenses and reserves 1,424,969us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 1,350,125us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities  
Employee stock option expense 315,711rvp_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCostRelatedToEmployee 315,711rvp_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCostRelatedToEmployee  
Non-employee stock option expense 15,546rvp_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCostRelatedToNonEmployee 15,546rvp_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCostRelatedToNonEmployee  
Inventory 287,190us-gaap_DeferredTaxAssetsInventory 338,253us-gaap_DeferredTaxAssetsInventory  
Litigation proceeds subject to stipulation 2,929,640us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLegalSettlements 2,929,640us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLegalSettlements  
Deferred tax assets 9,879,441us-gaap_DeferredTaxAssetsGross 8,971,009us-gaap_DeferredTaxAssetsGross  
Deferred tax liabilities      
Property and equipment (493,985)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (393,343)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
Deferred tax liabilities (493,985)us-gaap_DeferredIncomeTaxLiabilities (393,343)us-gaap_DeferredIncomeTaxLiabilities  
Net deferred assets 9,385,456rvp_DeferredTaxAssetsLiabilitiesNetBeforeValuation 8,577,666rvp_DeferredTaxAssetsLiabilitiesNetBeforeValuation  
Valuation allowance (9,385,456)us-gaap_DeferredTaxAssetsValuationAllowance (8,577,666)us-gaap_DeferredTaxAssetsValuationAllowance  
Increase (decrease) in valuation allowance $ 807,790us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount $ 2,417,018us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount  
Reconciliation of income taxes based on the federal statutory rate and the effective income tax rate      
Income tax at the federal statutory rate (as a percent) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State tax, net of federal tax (as a percent) 2.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 2.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 2.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Increase in valuation allowance (as a percent) (34.30%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (39.30%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (28.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Permanent differences (as a percent) (0.70%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 1.20%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
Alternative minimum tax (as a percent)   (1.40%)rvp_EffectiveIncomeTaxRateReconciliationAlternativeMinimumTax  
Adjustment to temporary difference for stock options     (11.00%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
Other (as a percent) (3.20%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 1.60%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective tax rate (as a percent) (0.30%)us-gaap_EffectiveIncomeTaxRateContinuingOperations (1.50%)us-gaap_EffectiveIncomeTaxRateContinuingOperations (0.20%)us-gaap_EffectiveIncomeTaxRateContinuingOperations
Minimum      
Income tax examination      
State and local income tax returns, period subject to examination 3 years    
Maximum      
Income tax examination      
State and local income tax returns, period subject to examination 5 years