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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net income | $ 5,515 us-gaap_ProfitLoss | $ 9,665 us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Provision for doubtful accounts | 30 us-gaap_ProvisionForDoubtfulAccounts | 39 us-gaap_ProvisionForDoubtfulAccounts
Depreciation and amortization | 996 us-gaap_DepreciationDepletionAndAmortization | 1,237 us-gaap_DepreciationDepletionAndAmortization
Share-based compensation expense | 1,339 us-gaap_ShareBasedCompensation | 1,094 us-gaap_ShareBasedCompensation
Tax benefit from the exercise of stock options | (52)us-gaap_DeferredTaxExpenseFromStockOptionsExercised |
(Gain) loss on sale of property and equipment | (1,312)us-gaap_GainLossOnSaleOfPropertyPlantEquipment | 13 us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Deferred income taxes | 50 natr_DeferredIncomeTaxExpenseBenefitCashFlow | (3,823)natr_DeferredIncomeTaxExpenseBenefitCashFlow
Amortization of bond discount |  | 1 us-gaap_AmortizationOfDebtDiscountPremium
Purchase of trading investment securities | (112)us-gaap_PaymentsForPurchaseOfSecuritiesOperatingActivities | (67)us-gaap_PaymentsForPurchaseOfSecuritiesOperatingActivities
Proceeds from sale of trading investment securities | 55 us-gaap_ProceedsFromSaleOfSecuritiesOperatingActivities | 49 us-gaap_ProceedsFromSaleOfSecuritiesOperatingActivities
Realized and unrealized gains on investments | (46)us-gaap_GainLossOnInvestments | (15)us-gaap_GainLossOnInvestments
Foreign exchange losses | 351 us-gaap_ForeignCurrencyTransactionGainLossUnrealized | 980 us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Changes in assets and liabilities: |  |
Accounts receivable | (1,411)us-gaap_IncreaseDecreaseInAccountsReceivable | (1,170)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories | (1,989)us-gaap_IncreaseDecreaseInInventories | 707 us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets | (1,837)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | (2,011)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Other assets | 74 us-gaap_IncreaseDecreaseInOtherOperatingAssets | (390)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable | 3,010 us-gaap_IncreaseDecreaseInAccountsPayable | (274)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued volume incentives | 1,539 natr_IncreaseDecreaseInAccruedVolumeIncentives | 1,513 natr_IncreaseDecreaseInAccruedVolumeIncentives
Accrued liabilities | (6,707)us-gaap_IncreaseDecreaseInAccruedLiabilities | (6,156)us-gaap_IncreaseDecreaseInAccruedLiabilities
Deferred revenue | (461)us-gaap_IncreaseDecreaseInDeferredRevenue | 58 us-gaap_IncreaseDecreaseInDeferredRevenue
Income taxes payable | (268)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | (940)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Liability related to unrecognized tax benefits | 230 natr_IncreaseDecreaseInLiabilityRelatedToUnrecognizedTaxPositions | (53)natr_IncreaseDecreaseInLiabilityRelatedToUnrecognizedTaxPositions
Deferred compensation payable | 80 us-gaap_IncreaseDecreaseInDeferredCompensation | 33 us-gaap_IncreaseDecreaseInDeferredCompensation
Net cash provided (used) by operating activities | (926)us-gaap_NetCashProvidedByUsedInOperatingActivities | 490 us-gaap_NetCashProvidedByUsedInOperatingActivities
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Purchases of property, plant and equipment | (6,019)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (4,614)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of property, plant and equipment | 1,312 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment |
Purchase of investments available for sale | (15)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (6)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Proceeds from investments available for sale | 0 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | 33 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Net cash used in investing activities | (4,722)us-gaap_NetCashProvidedByUsedInInvestingActivities | (4,587)us-gaap_NetCashProvidedByUsedInInvestingActivities
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Payments of cash dividends | (1,865)us-gaap_PaymentsOfDividends |
Borrowings on revolving credit facility | 348 us-gaap_ProceedsFromLinesOfCredit |
Principal payments of long-term debt and revolving credit facility |  | (847)us-gaap_RepaymentsOfLongTermDebt
Proceeds from exercise of stock options | 1,640 us-gaap_ProceedsFromStockOptionsExercised |
Tax benefit from stock option exercise | 52 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities |
Repurchase of common stock | (2,857)us-gaap_PaymentsForRepurchaseOfCommonStock |
Net cash provided by (used in) financing activities | (2,682)us-gaap_NetCashProvidedByUsedInFinancingActivities | (847)us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rates on cash and cash equivalents | (304)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents | (836)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net decrease in cash and cash equivalents | (8,634)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (5,780)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of the period | 58,699 us-gaap_CashAndCashEquivalentsAtCarryingValue | 77,247 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of the period | 50,065 us-gaap_CashAndCashEquivalentsAtCarryingValue | 71,467 us-gaap_CashAndCashEquivalentsAtCarryingValue
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION: |  |
Cash paid for income taxes | 2,608 us-gaap_IncomeTaxesPaid | 2,236 us-gaap_IncomeTaxesPaid
Cash paid for interest | $ 25 us-gaap_InterestPaid | $ 30 us-gaap_InterestPaid

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition Cash paid to purchase debt and equity securities, classified as operating activities, during the period; includes trading securities and any other investments classified as operating. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The cash outflow to reacquire common stock during the period. + 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 + Details
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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + 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 + Details
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- Definition The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition Cash received from sale of investments in debt and equity securities, classified as operating activities, during the period; includes trading securities and any other investments classified as operating. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + 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 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 + Details
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