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STOCK OPTION PLAN (Details) (USD $) | 0 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 28, 2014 | Dec. 31, 2014 Plan | Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of active stock based compensation plan |  | 1 mtex_NumberOfActiveStockBasedCompensationPlan |  |  |
Option contract term |  | P10Y |  |  |
Percentages of stock option ownership considered for higher exercise price of option (in hundredths) |  | 10.00%mtex_PercentagesOfStockOptionOwnershipConsideredForHigherExercisePriceOfOption |  |  |
Option exercise price as percentages of closing exercise price of stock for specific shareholders (in hundredths) |  | 110.00%mtex_OptionExercisePriceAsPercentagesOfClosingExercisePrice |  |  |
Expiration period of stock option plan |  | 5 years |  |  |
Number of shares authorized (in shares) |  | 1,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized |  |  |
Increase in number of shares authorized (in shares) | 130,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized | 100,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized |  |  |
Number of shares available for grant (in shares) |  | 135,871 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant |  |  |
Intrinsic value of exercised options |  | $ 200,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue |  | $ 200,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue |
Non-vested shares (in shares) |  | 121,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares |  | 89,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares |
New shares issued (in shares) |  | 16,164 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod |  |  |
Number of Options [Roll Forward] |  |  |  |  |
Outstanding at beginning of year (in shares) |  | 188,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  |  |
Granted (in shares) |  | 95,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross |  |  |
Exercised (in shares) |  | (16,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |  |
Forfeited or expired (in shares) |  | (18,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod |  |  |
Outstanding at end of year (in shares) |  | 249,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  | 188,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |
Options exercisable at year end (in shares) |  | 129,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber |  |  |
Weighted average exercise price [Roll Forward] |  |  |  |  |
Outstanding at beginning of year (in dollars per share) |  | $ 14.29 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |  |  |
Granted (in dollars per share) |  | $ 18.17 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice |  |  |
Exercised (in dollars per share) |  | $ 5.56 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice |  |  |
Forfeited or expired (in dollars per share) |  | $ 9.14 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice |  |  |
Outstanding at end of year (in dollars per share) |  | $ 16.71 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |  | $ 14.29 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |
Options exercisable at year end (in dollars per share) |  | $ 19.46 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice |  |  |
Weighted average remaining contractual life (in years) [Abstract] |  |  |  |  |
Outstanding at end of year |  | 7 years 4 months 24 days |  |  |
Options exercisable at year end |  | 6 years 1 month 6 days |  |  |
Aggregate intrinsic value [Abstract] |  |  |  |  |
Outstanding at end of year |  | 2,474,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue |  |  |
Options exercisable at year end |  | 4,138,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 |  |  |
Assumptions used to calculate compensation expense and fair value of stock options granted [Abstract] |  |  |  |  |
Dividend yield (in hundredths) |  | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate | [1] | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate | [1]
Risk-free interest rate, minimum (in hundredths) |  | 1.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum |  | 0.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum |
Risk-free interest rate, maximum (in hundredths) |  | 1.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum |  | 1.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum |
Expected market price volatility, minimum (in hundredths) |  | 77.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum |  | 80.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum |
Expected market price volatility, maximum (in hundredths) |  | 80.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum |  | 82.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum |
Average expected life of stock options |  | 4 years 6 months |  | 4 years 6 months |
Weighted-average grant-date fair value (in dollars per share) |  | $ 11.25 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue |  | $ 3.96 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue |
Total fair value of shares vested |  | 100,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 |  | 100,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 |
Summary of amounts related to the expense of the fair values of options [Abstract] |  |  |  |  |
Selling, general and administrative expenses and income from operations before income taxes |  | 512,000 us-gaap_AllocatedShareBasedCompensationExpense |  | 173,000 us-gaap_AllocatedShareBasedCompensationExpense |
Benefit for income taxes |  | (137,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense |  | (33,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense |
Effect on net income |  | 375,000 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax |  | 140,000 us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax |
Unrecognized compensation expense [Abstract] |  |  |  |  |
Total gross unrecognized compensation expense in 2015 |  | 425,000 mtex_GrossUnrecognizedCompensationExpenseDueCurrent |  |  |
Total gross unrecognized compensation expense in 2016 |  | 225,000 mtex_GrossUnrecognizedCompensationExpenseYearTwo |  |  |
Total gross unrecognized compensation expense in 2017 |  | 69,000 mtex_GrossUnrecognizedCompensationExpenseYearThree |  |  |
Total unrecognized compensation expense |  | 719,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions |  |  |
Tax benefit associated with unrecognized compensation expense in 2015 |  | 82,000 mtex_TaxBenefitAssociatedWithUnrecognizedCompensationExpenseDueCurrent |  |  |
Tax benefit associated with unrecognized compensation expense in 2016 |  | 18,000 mtex_TaxBenefitAssociatedWithUnrecognizedCompensationExpenseYearTwo |  |  |
Tax benefit associated with unrecognized compensation expense in 2017 |  | 0 mtex_TaxBenefitAssociatedWithUnrecognizedCompensationExpenseYearThree |  |  |
Total tax benefit associated with unrecognized compensation expense |  | 100,000 mtex_TotalTaxBenefitAssociatedWithUnrecognizedCompensationExpense |  |  |
Total net unrecognized compensation expense in 2015 |  | 343,000 mtex_TotalNetUnrecognizedCompensationExpenseDueCurrent |  |  |
Total net unrecognized compensation expense in 2016 |  | 207,000 mtex_TotalNetUnrecognizedCompensationExpenseYearTwo |  |  |
Total net unrecognized compensation expense in 2017 |  | 69,000 mtex_TotalNetUnrecognizedCompensationExpenseYearThree |  |  |
Total net unrecognized compensation expense |  | $ 619,000 mtex_TotalNetUnrecognizedCompensationExpense |  |  |
Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period of stock options |  | 2 years |  |  |
Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period of stock options |  | 3 years |  |  |
Board of Directors [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares available for grant (in shares) |  | 6,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_TitleOfIndividualAxis = us-gaap_ManagementMember |  |  |
[1] | The Company declared no dividends in 2014 or 2013.

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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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