Annual report pursuant to Section 13 and 15(d)

NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES (Details 5)

v2.4.1.9
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
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