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BALANCE SHEETS (USD $)
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 22,128,977us-gaap_CashAndCashEquivalentsAtCarryingValue $ 27,629,359us-gaap_CashAndCashEquivalentsAtCarryingValue
Restricted cash 600,897us-gaap_RestrictedCashAndCashEquivalents  
Accounts receivable, net of allowance for doubtful accounts of $1,725,806 and $1,698,506, respectively 5,642,091us-gaap_AccountsReceivableNetCurrent 3,476,718us-gaap_AccountsReceivableNetCurrent
Inventories, net 4,663,548us-gaap_InventoryNet 5,735,589us-gaap_InventoryNet
Other current assets 1,194,055us-gaap_OtherAssetsCurrent 1,065,641us-gaap_OtherAssetsCurrent
Total current assets 34,229,568us-gaap_AssetsCurrent 37,907,307us-gaap_AssetsCurrent
Property, plant and equipment, net 10,852,853us-gaap_PropertyPlantAndEquipmentNet 10,910,172us-gaap_PropertyPlantAndEquipmentNet
Intangible and other assets, net 270,693rvp_IntangibleAssetsAndOtherAssetsNoncurrent 279,965rvp_IntangibleAssetsAndOtherAssetsNoncurrent
Total assets 45,353,114us-gaap_Assets 49,097,444us-gaap_Assets
Current liabilities:    
Accounts payable 5,142,796us-gaap_AccountsPayableCurrent 5,107,778us-gaap_AccountsPayableCurrent
Litigation proceeds subject to stipulation 7,724,826us-gaap_LitigationReserveCurrent 7,724,826us-gaap_LitigationReserveCurrent
Current portion of long-term debt 149,744us-gaap_LongTermDebtCurrent 247,064us-gaap_LongTermDebtCurrent
Accrued compensation 504,188us-gaap_EmployeeRelatedLiabilitiesCurrent 815,044us-gaap_EmployeeRelatedLiabilitiesCurrent
Dividends payable   57,613us-gaap_DividendsPayableCurrent
Accrued royalties to shareholders 787,434us-gaap_AccruedRoyaltiesCurrent 602,209us-gaap_AccruedRoyaltiesCurrent
Other accrued liabilities 782,322us-gaap_OtherAccruedLiabilitiesCurrent 1,975,018us-gaap_OtherAccruedLiabilitiesCurrent
Income taxes payable 8,290us-gaap_AccruedIncomeTaxesCurrent 90,972us-gaap_AccruedIncomeTaxesCurrent
Total current liabilities 15,099,600us-gaap_LiabilitiesCurrent 16,620,524us-gaap_LiabilitiesCurrent
Long-term debt, net of current maturities 3,425,028us-gaap_LongTermDebtNoncurrent 3,576,932us-gaap_LongTermDebtNoncurrent
Total liabilities 18,524,628us-gaap_Liabilities 20,197,456us-gaap_Liabilities
Commitments and contingencies - See Note 8      
Preferred stock $1 par value:    
Common Stock, no par value; authorized: 100,000,000 shares; outstanding: 27,613,397 and 27,187,702 shares, respectively      
Additional paid-in capital 59,273,769us-gaap_AdditionalPaidInCapitalPreferredStock 58,983,166us-gaap_AdditionalPaidInCapitalPreferredStock
Retained deficit (32,336,119)us-gaap_RetainedEarningsAccumulatedDeficit (29,981,514)us-gaap_RetainedEarningsAccumulatedDeficit
Common stock in treasury - at cost; 722,920 shares (1,096,609)us-gaap_TreasuryStockValue (1,096,609)us-gaap_TreasuryStockValue
Total stockholders' equity 26,828,486us-gaap_StockholdersEquity 28,899,988us-gaap_StockholdersEquity
Total liabilities and stockholders' equity 45,353,114us-gaap_LiabilitiesAndStockholdersEquity 49,097,444us-gaap_LiabilitiesAndStockholdersEquity
Series I, Class B    
Preferred stock $1 par value:    
Preferred stock 98,500us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= rvp_SeriesOneConvertibleClassBPreferredStockMember		 103,500us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= rvp_SeriesOneConvertibleClassBPreferredStockMember
Series II, Class B    
Preferred stock $1 par value:    
Preferred stock 176,200us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= rvp_SeriesTwoConvertibleClassBPreferredStockMember		 178,700us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= rvp_SeriesTwoConvertibleClassBPreferredStockMember
Series III, Class B    
Preferred stock $1 par value:    
Preferred stock 130,245us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= rvp_SeriesThreeConvertibleClassBPreferredStockMember		 130,245us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= rvp_SeriesThreeConvertibleClassBPreferredStockMember
Series IV, Class B    
Preferred stock $1 par value:    
Preferred stock 542,500us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= rvp_SeriesFourConvertibleClassBPreferredStockMember		 542,500us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= rvp_SeriesFourConvertibleClassBPreferredStockMember
Series V, Class B    
Preferred stock $1 par value:    
Preferred stock $ 40,000us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= rvp_SeriesFiveConvertibleClassBPreferredStockMember		 $ 40,000us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= rvp_SeriesFiveConvertibleClassBPreferredStockMember