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STOCK REPURCHASE PROGRAM (Details) (USD $)	0 Months Ended					3 Months Ended				12 Months Ended
	Jul. 22, 2013	Apr. 22, 2013	Jan. 21, 2013	Oct. 22, 2012	Jul. 31, 2012	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock repurchase program
Stock repurchased under the Common Stock repurchase plan (in shares)											655,818us-gaap_StockRepurchasedDuringPeriodShares	67,102us-gaap_StockRepurchasedDuringPeriodShares
Preferred stock dividends paid										$ 172,838us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock	$ 230,449us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock	$ 230,450us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock
Series I, Class B
Stock repurchase program
Preferred stock dividends paid	12,938us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = rvp_SeriesOneConvertibleClassBPreferredStockMember	12,938us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = rvp_SeriesOneConvertibleClassBPreferredStockMember	12,938us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = rvp_SeriesOneConvertibleClassBPreferredStockMember	12,938us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = rvp_SeriesOneConvertibleClassBPreferredStockMember	38,813us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = rvp_SeriesOneConvertibleClassBPreferredStockMember	12,938us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = rvp_SeriesOneConvertibleClassBPreferredStockMember	12,938us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = rvp_SeriesOneConvertibleClassBPreferredStockMember	12,938us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = rvp_SeriesOneConvertibleClassBPreferredStockMember	12,938us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = rvp_SeriesOneConvertibleClassBPreferredStockMember	38,814us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = rvp_SeriesOneConvertibleClassBPreferredStockMember	38,814us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = rvp_SeriesOneConvertibleClassBPreferredStockMember	51,751us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = rvp_SeriesOneConvertibleClassBPreferredStockMember
Series II, Class B
Stock repurchase program
Preferred stock dividends paid	$ 44,675us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = rvp_SeriesTwoConvertibleClassBPreferredStockMember	$ 44,675us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = rvp_SeriesTwoConvertibleClassBPreferredStockMember	$ 44,675us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = rvp_SeriesTwoConvertibleClassBPreferredStockMember	$ 44,675us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = rvp_SeriesTwoConvertibleClassBPreferredStockMember	$ 134,025us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = rvp_SeriesTwoConvertibleClassBPreferredStockMember	$ 44,675us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = rvp_SeriesTwoConvertibleClassBPreferredStockMember	$ 44,675us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = rvp_SeriesTwoConvertibleClassBPreferredStockMember	$ 44,675us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = rvp_SeriesTwoConvertibleClassBPreferredStockMember	$ 44,675us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = rvp_SeriesTwoConvertibleClassBPreferredStockMember	$ 134,025us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = rvp_SeriesTwoConvertibleClassBPreferredStockMember	$ 134,025us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = rvp_SeriesTwoConvertibleClassBPreferredStockMember	$ 178,700us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = rvp_SeriesTwoConvertibleClassBPreferredStockMember

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- Definition

Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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