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STOCK-BASED COMPENSATION (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Plan
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of active stock based compensation plan 1mtex_NumberOfActiveStockBasedCompensationPlan  
Option contract term 10  
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) 200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized  
Increase in number of shares authorized (in shares) 100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized  
Number of shares available for grant (in shares) 155,550us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant  
Expiration date of stock option plan Feb. 20, 2018  
Options granted (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 66,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Weighted average grant date fair value (in dollars per share)   $ 12.09us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Share-based compensation expense [Abstract]    
Total gross compensation expense $ 141us-gaap_AllocatedShareBasedCompensationExpense $ 178us-gaap_AllocatedShareBasedCompensationExpense
Total tax benefit associated with compensation expense 31us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 60us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Total net compensation expense 110us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax 118us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Unrecognized compensation expense [Abstract]    
Total gross unrecognized compensation expense to be recognized over remainder of current fiscal year 278mtex_GrossUnrecognizedCompensationExpenseToBeRecognizedInCurrentFiscalYear  
Total gross unrecognized compensation expense in 2016 215mtex_GrossUnrecognizedCompensationExpenseYearTwo  
Total gross unrecognized compensation expense in 2017 63mtex_GrossUnrecognizedCompensationExpenseYearThree  
Total gross unrecognized compensation expense in 2018 6mtex_TotalGrossUnrecognizedCompensationExpenseYearFour  
Tax benefit associated with unrecognized compensation expense remainder of current fiscal year 50mtex_TaxBenefitAssociatedWithUnrecognizedCompensationExpense  
Tax benefit associated with unrecognized compensation expense in 2016 14mtex_TaxBenefitAssociatedWithUnrecognizedCompensationExpenseYearTwo  
Tax benefit associated with unrecognized compensation expense in 2017 0mtex_TaxBenefitAssociatedWithUnrecognizedCompensationExpenseYearThree  
Tax benefit associated with unrecognized compensation expense in 2018 0mtex_TaxBenefitAssociatedWithUnrecognizedCompensationExpenseYearFour  
Total net unrecognized compensation expense 228mtex_TotalNetUnrecognizedCompensationExpense  
Total net unrecognized compensation expense in 2016 201mtex_TotalNetUnrecognizedCompensationExpenseYearTwo  
Total net unrecognized compensation expense in 2017 63mtex_TotalNetUnrecognizedCompensationExpenseYearThree  
Total net unrecognized compensation expense in 2018 $ 6mtex_TotalNetUnrecognizedCompensationExpenseYearFour  
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