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CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified | Common Stock | Retained Earnings | Noncontrolling Interest | Accumulated Other Comprehensive Income (Loss) | Total
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2014 | $ 125,489 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 10,891 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 3,781 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | $ (11,204)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 128,957 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Balance (in shares) at Dec. 31, 2014 | 18,662 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | 18,662 us-gaap_CommonStockSharesIssued
Increase (Decrease) in Shareholders' Equity |  |  |  |  |
Share-based compensation expense | 1,339 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | 1,339 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross
Proceeds from the exercise of stock options, and issuance of restricted stock units | 1,640 natr_StockIssuedDuringPeriodValueStockOptionsAndRestrictedStockExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | 1,640 natr_StockIssuedDuringPeriodValueStockOptionsAndRestrictedStockExercised
Proceeds from the exercise of stock options , and issuance of restricted stock units (in shares) | 249 natr_StockIssuedDuringPeriodSharesStockOptionsAndRestrictedStockExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Tax benefit from exercise of stock options | 52 us-gaap_DeferredTaxExpenseFromStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | 52 us-gaap_DeferredTaxExpenseFromStockOptionsExercised
Repurchase of common stock | (2,857)us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | (2,857)us-gaap_StockRepurchasedDuringPeriodValue
Repurchase of common stock (in shares) | (202)us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | (202)us-gaap_StockRepurchasedDuringPeriodShares
Cash dividends (0.10 per share) |  | (1,865)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (1,865)us-gaap_DividendsCommonStockCash
Net income |  | 5,667 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (152)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  | 5,515 us-gaap_ProfitLoss
Other comprehensive income |  |  |  | 1 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 1 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Balance at Mar. 31, 2015 | $ 125,663 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 14,693 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 3,629 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | $ (11,203)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 132,782 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Balance (in shares) at Mar. 31, 2015 | 18,709 us-gaap_CommonStockSharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | 18,709 us-gaap_CommonStockSharesIssued

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4568447-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4568740-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=31814832&loc=SL4590271-111686 + Details
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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 + Details
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