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CONDENSED STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:      
Net loss $ (2,354,605)us-gaap_NetIncomeLoss $ (6,213,852)us-gaap_NetIncomeLoss $ (4,132,892)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash provided (used) by operating activities:      
Depreciation and amortization 1,074,520us-gaap_DepreciationDepletionAndAmortization 1,284,249us-gaap_DepreciationDepletionAndAmortization 1,335,858us-gaap_DepreciationDepletionAndAmortization
Share based compensation   52,775us-gaap_ShareBasedCompensation  
Provision for doubtful accounts 27,300us-gaap_ProvisionForDoubtfulAccounts 50,000us-gaap_ProvisionForDoubtfulAccounts 107,246us-gaap_ProvisionForDoubtfulAccounts
Provision for inventory valuation   530,000us-gaap_InventoryWriteDown 120,000us-gaap_InventoryWriteDown
Gain on disposal of assets   (1,000)us-gaap_GainLossOnDispositionOfAssets  
Accreted interest     3,773us-gaap_AccretionExpense
(Increase) decrease in assets:      
Inventories 1,072,041us-gaap_IncreaseDecreaseInInventories (1,275,336)us-gaap_IncreaseDecreaseInInventories 1,127,166us-gaap_IncreaseDecreaseInInventories
Accounts receivable (2,192,673)us-gaap_IncreaseDecreaseInAccountsReceivable 167,589us-gaap_IncreaseDecreaseInAccountsReceivable (66,867)us-gaap_IncreaseDecreaseInAccountsReceivable
Income taxes receivable   9,431us-gaap_IncreaseDecreaseInIncomeTaxesReceivable 30,054us-gaap_IncreaseDecreaseInIncomeTaxesReceivable
Other current assets (128,414)us-gaap_IncreaseDecreaseInOtherCurrentAssets (281,881)us-gaap_IncreaseDecreaseInOtherCurrentAssets (565,231)us-gaap_IncreaseDecreaseInOtherCurrentAssets
Increase (decrease) in liabilities:      
Accounts payable 35,018us-gaap_IncreaseDecreaseInAccountsPayable 7,895us-gaap_IncreaseDecreaseInAccountsPayable 1,441,308us-gaap_IncreaseDecreaseInAccountsPayable
Litigation proceeds subject to stipulation   7,724,826rvp_IncreaseDecreaseInLitigationReserve  
Other accrued liabilities (1,318,327)us-gaap_IncreaseDecreaseInOtherAccruedLiabilities 787,902us-gaap_IncreaseDecreaseInOtherAccruedLiabilities 787,393us-gaap_IncreaseDecreaseInOtherAccruedLiabilities
Income taxes payable (82,682)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable 90,971us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable (29,471)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Net cash provided (used) by operating activities (3,867,822)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 2,933,569us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 158,337us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:      
Purchase of property, plant, and equipment (1,007,933)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (283,289)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (510,117)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Changes in restricted cash (600,897)us-gaap_IncreaseDecreaseInRestrictedCash    
Proceeds from sale of assets   1,000us-gaap_ProceedsFromSaleOfProductiveAssets  
Net cash used by investing activities (1,608,830)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (282,289)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (510,117)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:      
Repayments of long-term debt and notes payable (249,220)us-gaap_ProceedsFromRepaymentsOfLongTermDebtAndCapitalSecurities (317,303)us-gaap_ProceedsFromRepaymentsOfLongTermDebtAndCapitalSecurities (626,219)us-gaap_ProceedsFromRepaymentsOfLongTermDebtAndCapitalSecurities
Proceeds from the exercise of stock options 398,328us-gaap_ProceedsFromStockOptionsExercised 536,925us-gaap_ProceedsFromStockOptionsExercised 1,620,701us-gaap_ProceedsFromStockOptionsExercised
Repurchase of Common Stock   (974,407)us-gaap_PaymentsForRepurchaseOfCommonStock (122,202)us-gaap_PaymentsForRepurchaseOfCommonStock
Payment of Preferred Stock dividends (172,838)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock (230,449)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock (230,450)us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
Net cash provided (used) by financing activities (23,730)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (985,234)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 641,830us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase (decrease) in cash and cash equivalents (5,500,382)us-gaap_NetCashProvidedByUsedInContinuingOperations 1,666,046us-gaap_NetCashProvidedByUsedInContinuingOperations 290,050us-gaap_NetCashProvidedByUsedInContinuingOperations
Cash and cash equivalents at:      
Beginning of period 27,629,359us-gaap_CashAndCashEquivalentsAtCarryingValue 25,963,313us-gaap_CashAndCashEquivalentsAtCarryingValue 25,673,263us-gaap_CashAndCashEquivalentsAtCarryingValue
End of period 22,128,977us-gaap_CashAndCashEquivalentsAtCarryingValue 27,629,359us-gaap_CashAndCashEquivalentsAtCarryingValue 25,963,313us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental schedule of cash flow information:      
Interest paid 222,808us-gaap_InterestPaid 241,052us-gaap_InterestPaid 264,033us-gaap_InterestPaid
Income taxes paid 94,332us-gaap_IncomeTaxesPaid 7,988us-gaap_IncomeTaxesPaid 3,474us-gaap_IncomeTaxesPaid
Supplemental schedule of noncash investing and financing activities:      
Preferred dividends declared, not paid   $ 57,613us-gaap_DividendsPreferredStockCash $ 57,613us-gaap_DividendsPreferredStockCash