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NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (Details 5) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Incentive Trip Accrual |  |  |  |  |  |  |  |  |  |  |
Convention and meeting costs | $ 4,243natr_AccruedConventionAndMeetingCostsCurrent |  |  |  | $ 5,784natr_AccruedConventionAndMeetingCostsCurrent |  |  |  | $ 4,243natr_AccruedConventionAndMeetingCostsCurrent | $ 5,784natr_AccruedConventionAndMeetingCostsCurrent |
Foreign Currency Translation |  |  |  |  |  |  |  |  |  |  |
Minimum cumulative inflation rate for considering a country to have a highly inflationary economy (as a percent) |  |  |  |  |  |  |  |  | 100.00%natr_MinimumCumulativeInflationRateForConsideringCountryToHaveHighlyInflationaryEconomy |  |
Period of cumulative inflation rate for considering a country to have a highly inflationary economy |  |  |  |  |  |  |  |  | 3 years |  |
Revenue Recognition |  |  |  |  |  |  |  |  |  |  |
Period for amortization membership fees |  |  |  |  |  |  |  |  | 1 year |  |
Period for sales return from date of purchase |  |  |  |  |  |  |  |  | 90 days |  |
Sales return |  |  |  |  |  |  |  |  | 1,525us-gaap_SalesReturnsGoods | 1,454us-gaap_SalesReturnsGoods | 2,249us-gaap_SalesReturnsGoods
Shipping and handling revenues |  |  |  |  |  |  |  |  | 9,795us-gaap_ShippingAndHandlingRevenue | 10,868us-gaap_ShippingAndHandlingRevenue | 11,264us-gaap_ShippingAndHandlingRevenue
Advertising Costs |  |  |  |  |  |  |  |  |  |  |
Advertising costs |  |  |  |  |  |  |  |  | 2,301us-gaap_AdvertisingExpense | 2,194us-gaap_AdvertisingExpense | 1,418us-gaap_AdvertisingExpense
Research and Development |  |  |  |  |  |  |  |  |  |  |
Research and development expenses |  |  |  |  |  |  |  |  | 2,457us-gaap_ResearchAndDevelopmentExpense | 2,039us-gaap_ResearchAndDevelopmentExpense | 1,464us-gaap_ResearchAndDevelopmentExpense
Net income available to common stockholders |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations | 874us-gaap_IncomeLossFromContinuingOperations | 5,097us-gaap_IncomeLossFromContinuingOperations | 3,550us-gaap_IncomeLossFromContinuingOperations | 10,236us-gaap_IncomeLossFromContinuingOperations | 1,813us-gaap_IncomeLossFromContinuingOperations | 4,686us-gaap_IncomeLossFromContinuingOperations | 6,088us-gaap_IncomeLossFromContinuingOperations | 5,066us-gaap_IncomeLossFromContinuingOperations | 19,757us-gaap_IncomeLossFromContinuingOperations | 17,653us-gaap_IncomeLossFromContinuingOperations | 24,908us-gaap_IncomeLossFromContinuingOperations
Income (loss) from discontinued operations | (4,964)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (4,106)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (316)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (571)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 30us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 164us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (36)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (202)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (9,957)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (44)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 472us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net income attributable to common shareholders | $ (3,897)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 1,017us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 3,234us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 9,665us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 1,843us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 4,850us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 6,052us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 4,864us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 10,019us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 17,609us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 25,380us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Basic weighted-average shares outstanding |  |  |  |  |  |  |  |  |  |  |
Basic weighted-average shares outstanding |  |  |  |  |  |  |  |  | 17,108us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 15,997us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 15,648us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic net per common share: |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations (in dollars per share) | $ 0.05us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.30us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.22us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.63us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.11us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.29us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.38us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.32us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.15us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.10us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.59us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Income (loss) from discontinued operations (in dollars per share) | $ (0.26)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare | $ (0.24)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare | $ (0.02)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare | $ (0.03)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare |  | $ 0.01us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare |  | $ (0.01)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare | $ (0.57)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare |  | $ 0.03us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare
Net income attributable to common shareholders (in dollars per share) | $ (0.21)us-gaap_EarningsPerShareBasic | $ 0.06us-gaap_EarningsPerShareBasic | $ 0.20us-gaap_EarningsPerShareBasic | $ 0.60us-gaap_EarningsPerShareBasic | $ 0.11us-gaap_EarningsPerShareBasic | $ 0.30us-gaap_EarningsPerShareBasic | $ 0.38us-gaap_EarningsPerShareBasic | $ 0.31us-gaap_EarningsPerShareBasic | $ 0.58us-gaap_EarningsPerShareBasic | $ 1.10us-gaap_EarningsPerShareBasic | $ 1.62us-gaap_EarningsPerShareBasic
Diluted Shares Outstanding |  |  |  |  |  |  |  |  |  |  |
Basic weighted-average shares outstanding |  |  |  |  |  |  |  |  | 17,108us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 15,997us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 15,648us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Stock-based awards (in shares) |  |  |  |  |  |  |  |  | 533us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 393us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 339us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Diluted weighted-average shares outstanding |  |  |  |  |  |  |  |  | 17,641us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 16,390us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 15,987us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted per common share: |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations (in dollars per share) | $ 0.05us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.29us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.22us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.61us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.11us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.28us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.38us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.31us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.12us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.08us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.56us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Income (loss) from discontinued operations (in dollars per share) | $ (0.25)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | $ (0.23)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | $ (0.02)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | $ (0.03)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare |  | $ 0.01us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare |  | $ (0.01)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | $ (0.56)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | $ (0.01)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare | $ 0.03us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare
Net income attributable to common shareholders (in dollars per share) | $ (0.20)us-gaap_EarningsPerShareDiluted | $ 0.06us-gaap_EarningsPerShareDiluted | $ 0.20us-gaap_EarningsPerShareDiluted | $ 0.58us-gaap_EarningsPerShareDiluted | $ 0.11us-gaap_EarningsPerShareDiluted | $ 0.29us-gaap_EarningsPerShareDiluted | $ 0.38us-gaap_EarningsPerShareDiluted | $ 0.30us-gaap_EarningsPerShareDiluted | $ 0.56us-gaap_EarningsPerShareDiluted | $ 1.07us-gaap_EarningsPerShareDiluted | $ 1.59us-gaap_EarningsPerShareDiluted
Potentially dilutive shares excluded from diluted per share amounts: |  |  |  |  |  |  |  |  |  |  |
Stock options (in shares) |  |  |  |  |  |  |  |  | 133natr_DilutiveSecuritiesExcludedFromComputationOfEarningsPerShare | 135natr_DilutiveSecuritiesExcludedFromComputationOfEarningsPerShare | 88natr_DilutiveSecuritiesExcludedFromComputationOfEarningsPerShare
Potentially anti-dilutive shares excluded from diluted per share amounts: |  |  |  |  |  |  |  |  |  |  |
Stock options (in shares) |  |  |  |  |  |  |  |  | 210us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 210us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 254us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

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- Definition Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 + Details
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 28A -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1500-109256 + Details
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- Definition Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256 + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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