Document And Entity Information Statistical Measurement [Axis] Note To Financial Statement Details Textual Significant Accounting Policies Note 1 - Organization and Summary of Significant Accounting Policies Income tax expense Income tax expense ecd_NonRule10b51ArrTrmntdFlag Non-Rule 10b5-1 Arrangement Terminated [Flag] Note 3 - Inventories ecd_NonRule10b51ArrAdoptedFlag Non-Rule 10b5-1 Arrangement Adopted [Flag] Note 5 - Notes Payable Trading Arrangements, by Individual [Table] Note 6 - Stock Based Compensation Material Terms of Trading Arrangement [Text Block] Note 7 - Shareholders' Equity Note 9 - Leases Note 10 - Fair Value Note 11 - Segment Information Note 12 - Earnings Per Share Comprehensive Income, Policy [Policy Text Block] Minimum [Member] Note 1 - Organization and Summary of Significant Accounting Policies - Cash, Cash Equivalents, and Restricted Cash (Details) Product and Service, Other [Member] Note 1 - Organization and Summary of Significant Accounting Policies - Accounts Receivable, Net (Details) Statistical Measurement [Domain] Note 1 - Organization and Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) Maximum [Member] Note 1 - Organization and Summary of Significant Accounting Policies - Other Assets (Details) Note 1 - Organization and Summary of Significant Accounting Policies - Accrued Expenses (Details) Note 1 - Organization and Summary of Significant Accounting Policies - Other Long-term Liabilities (Details) Note 1 - Organization and Summary of Significant Accounting Policies - Deferred Revenue (Details) us-gaap_IncreaseDecreaseInAccountsReceivable Accounts receivable Note 1 - Organization and Summary of Significant Accounting Policies - Deferred Revenue Loyalty Program (Details) Note 1 - Organization and Summary of Significant Accounting Policies - Deferred Revenue Commissions (Details) Note 1 - Organization and Summary of Significant Accounting Policies - Sales Return Reserve (Details) Note 3 - Inventories - Inventories (Details) Note 5 - Notes Payable - Future Principal Payments (Details) Note 6 - Stock Based Compensation - Compensation Expense (Details) Note 7 - Shareholders' Equity - Accumulated Other Comprehensive Loss (Details) Note 9 - Leases - Operating and Finance Leases (Details) Note 9 - Leases - Operating and Finance Leases (Details) (Parentheticals) Note 9 - Leases - Future Sublease Income and Maturities of Leases (Details) Note 10 - Fair Value - Financial Assets (Details) Note 10 - Fair Value - Financial Intruments Carrying Amount and Estimated Fair Value (Details) Note 11 - Segment Information - Revenue from Segments (Details) Note 11 - Segment Information - Consolidated Net Sales by Region (Details) Note 11 - Segment Information - Consolidated Net Sales by Products, Fees and Others (Details) Note 11 - Segment Information - Long-lived Assets by Geographic Area (Details) Note 11 - Segment Information - Inventory Balances by Region (Details) Note 12 - Earnings Per Share - Net EPS (Details) Counterparty Name [Axis] Notes To Financial Statements us-gaap_EffectiveIncomeTaxRateContinuingOperations Effective Income Tax Rate Reconciliation, Percent us-gaap_ForeignCurrencyTransactionGainLossUnrealized Unrealized (gain) loss from foreign exchange Notes To Financial Statements [Abstract] Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Human Resources Taxes payable us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable us-gaap_IncreaseDecreaseInIncomeTaxesReceivable Income tax receivable Counterparty Name [Domain] us-gaap_IncreaseDecreaseInInventories Inventories us-gaap_SharesOutstanding Balance (in shares) Balance (in shares) Segment Reporting [Text Block] Award Type [Axis] Segment Reporting [Table Text Block] Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: Preferred stock, $0.01 par value, 1,000,000 shares authorized, no shares issued or outstanding Plan Name [Axis] us-gaap_Liabilities Total liabilities Plan Name [Domain] Total gross compensation expense Share-Based Payment Arrangement, Expense us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and shareholders’ equity Consolidation Items [Axis] Cash and Cash Equivalent [Table] Title and Position [Axis] Segment Reporting [Table] us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets Prepaid expenses and other current assets Commissions and incentives Charge related to stock-based compensation us-gaap_ShareBasedCompensation Selling and administrative expenses Subsequent Event [Member] us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense Total tax benefit associated with compensation expense LIABILITIES AND SHAREHOLDERS’ EQUITY Consolidation Items [Domain] Lessee, Lease, Description [Table] Share-Based Payment Arrangement [Text Block] Americas [Member] Changes in operating assets and liabilities: Accounts payable us-gaap_IncreaseDecreaseInAccountsPayable Preferred stock, shares issued (in shares) Preferred stock, shares outstanding (in shares) us-gaap_CashHeldInForeignCurrency Cash and Cash Equivalent, Held in Foreign Currency Preferred stock, shares authorized (in shares) us-gaap_RestrictedCash Restricted Cash us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares) Portion at Fair Value Measurement [Member] Long-term restricted cash Reported Value Measurement [Member] Preferred stock, par value (in dollars per share) Asia Pacific [Member] Accrued expenses Current restricted cash us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect Net increase (decrease) in cash, cash equivalents, and restricted cash Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Table Text Block] us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents Cash, cash equivalents, and restricted cash Effect of currency exchange rate changes on cash and cash equivalents Money Market Funds (included in Cash and cash equivalents) Estimate of Fair Value Measurement [Member] New Accounting Pronouncements, Policy [Policy Text Block] us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations Cash, cash equivalents, and restricted cash at the beginning of the period Cash, cash equivalents, and restricted cash at the end of the period Statement [Table] Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Operating lease right-of-use assets acquired in exchange for new operating lease liabilities Long-term notes payable us-gaap_NotesPayableFairValueDisclosure Long-Term Debt, Type [Axis] Product and Service [Domain] us-gaap_LitigationReserve Estimated Litigation Liability Product and Service [Axis] Long-Term Debt, Maturity, Remainder of Year Total gross unrecognized compensation expense mtex_AverageCommonStockClosePrice Average Common Stock, Close Price (in dollars per share) Represent the average closing price of the common stock. us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue Total minimum lease payments, operating lease mtex_AnnualCashPreservationBenefit Annual Cash Preservation Benefit The value of annual cash preservation benefit. Distribution and warehouse Represent the amount of expense related to distribution and warehouse. Inventory balances by Geographic Areas [Table Text Block] Tabular disclosure of inventory, net, by geographic areas located in the entity's country of domicile and foreign countries in which the entity holds inventory. us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent Finance Lease, Weighted Average Discount Rate, Percent us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent Operating Lease, Weighted Average Discount Rate, Percent us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) 2027, operating lease Accrued lease restoration costs Represent the amount of accrued lease restoration costs. us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) Schedule of Maturities of Long-Term Debt [Table Text Block] Remaining 2026, operating lease Measurement Frequency [Axis] Assets [Abstract] 2028, operating lease Statement [Line Items] Fair Value Hierarchy and NAV [Axis] Common stock, shares issued (in shares) Award Type [Domain] Common stock, shares outstanding (in shares) Common stock, shares authorized (in shares) Schedule of Accrued Liabilities [Table Text Block] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Common stock, $0.0001 par value, 99,000,000 shares authorized, 2,742,857 shares issued and 1,929,670 shares outstanding as of March 31, 2026 and 2,742,857 shares issued and 1,900,930 shares outstanding as of December 31, 2025 Assets acquired through other financing arrangements Schedule of Inventory, Current [Table Text Block] Schedule of Cash and Cash Equivalents [Table Text Block] Accounts payable Present value of minimum lease payments, Finance Leases Finance Lease, Liability us-gaap_PolicyTextBlockAbstract Accounting Policies us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements us-gaap_TableTextBlock Notes Tables Short-Term Debt [Table] Accrued compensation Legal Matters and Contingencies [Text Block] us-gaap_ComprehensiveIncomeNetOfTax Comprehensive loss Finance lease liabilities, excluding current portion us-gaap_FinanceLeaseLiabilityPaymentsDue Total minimum lease payments Current portion of finance lease liabilities us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount Imputed interest, Finance Leases Accrued royalties 2028, finance lease Accrued legal and accounting fees Accrued rent expense us-gaap_AccruedLiabilitiesCurrent Accrued expenses Accrued Liabilities, Current Concentration Risk Type [Axis] 2027, finance lease Remaining 2026, finance lease us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount Imputed interest, Operating Leases Non-cash operating lease expense Operating lease liabilities, excluding current portion Accrued sales and other taxes Present value of minimum lease payments, Operating Leases Operating Lease, Liability Deferred Revenue, Loyalty Program, Disclosure [Table Text Block] Represent the tabular presentation of the deferred revenue from the loyalty program. Other accrued operating expenses Current portion of operating lease liabilities Charge related to stock-based compensation Amount of increase (decrease) to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement. Fair Value, Assets Measured on Recurring Basis [Table Text Block] Deferred Revenue, Commissions, Disclosure [Table Text Block] Represent the tabular presentation of the deferred revenue related to commissions. Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Taxes payable Concentration Risk Type [Domain] Long-Term Debt, Maturity, Year One CHINA Long-Term Debt Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Loss Contingencies [Table] Statement of Stockholders' Equity [Abstract] Statement of Comprehensive Income [Abstract] Statement of Cash Flows [Abstract] Statutory Accounting Practices [Table] us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent Current-period change (1) Shareholders’ equity: Long-Term Debt, Type [Domain] Equity Components [Axis] Equity Component [Domain] Fair Value, Inputs, Level 2 [Member] Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Fair Value, Inputs, Level 3 [Member] Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Equity [Text Block] Fair Value, Inputs, Level 1 [Member] AOCI Attributable to Parent [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] Share-Based Payment Arrangement, Option, Treasury Stock [Member] Represent the number of treasury stock shares issued to directors as part of their compensation. Provision for (reversal of) inventory losses mtex_CustomerLoyaltyProgramDeferredRevenue Loyalty deferred revenue at beginning of the period Loyalty deferred revenue at end of period Represent the amount of loyalty deferred revenue. Deferred commissions Deferred commissions at beginning of the period Total deferred commissions at end of the period Represent the amount of deferred commissions. Defined benefit plan obligation Subsequent Event Type [Domain] Recoveries in current period Subsequent Event Type [Axis] Comprehensive Income (Loss) [Table Text Block] KOREA, REPUBLIC OF Cost of sales Supplier Finance Program [Table] Deferred tax liabilities, net Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Substantial Doubt about Going Concern [Text Block] Fair Value Disclosures [Text Block] Share-Based Payment Arrangement, Option [Member] SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION: us-gaap_LiabilitiesCurrent Total current liabilities Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue [Table Text Block] Accounts receivable, net of allowance of $627 and $756 Thereafter, sublease Sublease Income, Future Payments Receivable, after Year Four Thereafter, finance lease Finance Lease, Liability, to be Paid, after Year Four Thereafter, operating lease Lessee, Operating Lease, Liability, to be Paid, after Year Four Lease, Cost [Table Text Block] Revenue Benchmark [Member] Accumulated other comprehensive loss Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Long-Lived Asset [Table Text Block] us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax Total net compensation expense us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest Income (loss) before income taxes Additional paid-in capital Debt Disclosure [Text Block] Use of Estimates, Policy [Policy Text Block] Prepaid expenses and other current assets us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1 Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Acquisition of property and equipment UNITED STATES us-gaap_DebtInstrumentFaceAmount Debt Instrument, Face Amount Schedule of Other Assets [Table Text Block] us-gaap_AssetsCurrent Total current assets Geographic Concentration Risk [Member] Fair Value, Recurring and Nonrecurring [Table] mtex_PolicyTable mtex_AccountsReceivableAllowanceForCreditLossWriteoffNet Accounts charged off against the allowance Net amount of direct write-downs of accounts receivable charged against the allowance. us-gaap_GrossProfit Gross profit Debt Instrument, Name [Domain] us-gaap_DebtInstrumentInterestRateStatedPercentage Debt Instrument, Interest Rate, Stated Percentage mtex_WorkingCapitalDeficit Working Capital (Deficit) Represents the value of total current assets net of current liabilities as of the balance sheet date. Asia Pacific, Other [Member] Represents other countries in the Asian Pacific region. Americas, Other [Member] Represents the Americas, other. Debt Instrument [Axis] Property, Plant and Equipment with Construction in Progress, Net Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business, including construction in progress, to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. CASH FLOWS FROM OPERATING ACTIVITIES: Issuance of unrestricted shares CASH FLOWS FROM INVESTING ACTIVITIES: Issuance of unrestricted shares (in shares) Stock Issued During Period, Shares, Treasury Stock Reissued (in shares) Raw materials us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash provided by (used in) operating activities CASH FLOWS FROM FINANCING ACTIVITIES: us-gaap_NetCashProvidedByUsedInInvestingActivities Cash used in investing activities Finished goods and promotional materials us-gaap_NetCashProvidedByUsedInFinancingActivities Cash used in financing activities Accounts Receivable, Allowance for Credit Loss [Table Text Block] Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Operating Segments [Member] Accounting Policies [Abstract] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Allowance for credit loss us-gaap_NoncurrentAssets Long-lived Assets Accounts Receivable [Policy Text Block] Income Statement [Abstract] Reconciliation of profit or loss us-gaap_NumberOfReportableSegments Number of Reportable Segments Deferred income taxes us-gaap_TreasuryStockCommonValue Treasury stock, at average cost, 813,187 shares as of March 31, 2026 and 841,927 shares as of December 31, 2025 us-gaap_AmortizationOfDeferredSalesCommissions Amount recognized as commissions expense Treasury stock, shares (in shares) Treasury Stock, Common, Shares (in shares) Treasury Stock, Common [Member] Net income (loss) attributable to common stockholders Net income (loss) Net income (loss) Accumulated Other Comprehensive Income (Loss) [Table] Unsecured Debt [Member] Income Tax Disclosure [Text Block] Restricted Stock [Member] Measurement Basis [Axis] Fair Value Hierarchy and NAV [Domain] Measurement Frequency [Domain] Statement of Financial Position [Abstract] mtex_ContractWithCustomerLiabilityRevenueRecognizedIncludingBeginningPeriodBalance Amount recognized as revenue during the period that is included in beginning of the period Amount of revenue recognized including beginning period balance reataed to contract with customer liability. Loyalty Program [Member] Represent loyalty program. New deferrals at the end of the period, net Amount of new deferrals at the end of the period. Income taxes paid Income tax receivable us-gaap_RepaymentsOfNotesPayable Repayment of note payable Common Stock Outstanding [Member] Represent the outstanding common stock. Other Long-term Liabilities, Policy [Policy Text Block] Disclosure of other long-term liabilities policy. Other Assets [Policy Text Block] Disclosure of other assets accounting policy us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities Repayment of finance lease obligations and other long-term liabilities mtex_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodTotalFairValue Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options Granted in Period, Total Fair Value Amount of Share-based compensation arrangement by share-based payment award, equity instruments other than options granted in period, total fair value. Provision in current period mtex_ContractWithCustomerRefundLiabilityProvisionExpense Amount of provision expense related to contract with customer refund liability. Sales Refund and Allowances [Policy Text Block] Disclosure of sales refund and allowances policy. us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1 Finance Lease, Weighted Average Remaining Lease Term (Year) Returns charged off against the reserve mtex_ContractWithCustomerRefundLiabilityWriteOffs Amount of write-offs related to the contract with customer refund liability. mtex_LesseeOperatingSubleaseTermOfContract Lessee Operating Sublease, Term of Contract (Year) Represent term of contract. mtex_LossContingencyOpenOrPendingClaimsNumber Loss Contingency Open or Pending Claims Number Number of pending claims. Fair Value, Recurring [Member] Other assets Other Assets, Noncurrent Deferred revenue us-gaap_IncreaseDecreaseInDeferredRevenue us-gaap_IncreaseDecreaseInOtherOperatingAssets Other assets Document Type Operating expenses: Document Information [Line Items] Document Quarterly Report Concentration Risk, Percentage us-gaap_ConcentrationRiskPercentage1 us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1 Operating Lease, Weighted Average Remaining Lease Term (Year) Document Information [Table] us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) Entity Interactive Data Current us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) Document Transition Report Weighted-average common shares outstanding: Diluted (in shares) Weighted average common and common equivalent shares outstanding (in shares) Incentive Option [Member] Represent incentive option granted to employees. us-gaap_OperatingExpenses Total operating expenses Income (loss) per common share: Freight and Shipping Fees, Policy [Policy Text Block] Disclosure of freight and shipping fees policy. Dilutive effect of outstanding common stock options and RSU’s (in shares) us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements Weighted average common shares outstanding (for basic calculation) (in shares) Basic (in shares) Weighted Average Number of Shares Outstanding, Basic (in shares) Income (loss) per share - Basic (in dollars per share) Basic (in dollars per share) us-gaap_NotesPayable Notes Payable Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Other Noncurrent Liabilities [Table Text Block] Current notes payable Notes Payable, Current Effective Income Tax Rate Reconciliation [Table] Long-term notes payable Notes Payable, Noncurrent EMEA [Member] Title and Position [Domain] Commissions and incentives payable Represent the carrying value as of the balance sheet date of commissions and incentives payable. Deposits for building leases Manapol Trademark Document Fiscal Period Focus Document Fiscal Year Focus Investment, Name [Domain] Depreciation and amortization us-gaap_DepreciationAndAmortization Restricted cash Amendment Flag us-gaap_SubleaseIncome Sublease Income Other long-term liabilities Document Period End Date Nonconsolidated Investees, Other [Member] Commissions and incentives payable mtex_IncreaseDecreaseInCommissionsAndIncentivesPayable The increase (decrease) during the period in the commissions and incentives payable. mtex_IncreaseDecreaseInDeferredCommissions Deferred commissions Amount of increase (decrease) in deferred commissions. us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) Legal Entity [Axis] mtex_NumberOfRegionsInWhichEntityOperates Number of Regions in Which Entity Operates The number of regions in which the entity operates as of balance sheet date. us-gaap_FinancialLiabilitiesFairValueDisclosure Financial Liabilities Fair Value Disclosure Financing Receivable, Allowance for Credit Loss [Table] Entity File Number us-gaap_RevenueRemainingPerformanceObligation Revenue, Remaining Performance Obligation, Amount Entity Tax Identification Number NON-CASH INVESTING AND FINANCING ACTIVITIES: Disaggregation of Revenue [Table] Entity [Domain] Entity Central Index Key Entity Registrant Name Investment in Korea Mutual Aid Cooperative & Consumer Foreign currency translations Entity Current Reporting Status Entity Incorporation, State or Country Code Current Fiscal Year End Date Entity Filer Category Entity Shell Company Entity Emerging Growth Company Entity Small Business us-gaap_OperatingIncomeLoss Loss from operations Accrued Expenses, Policy [Policy Text Block] Represent the policy for accrued expenses. Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Accrued shipping and handling costs Represent the value as of the balance sheet date of obligations incurred related to shipping and handling costs. Customer deposits and sales returns Represent the value as of the balance sheet date of obligations incurred related to customer deposits and sales return. Accrued inventory purchases Represent the value as of the balance sheet date of obligations incurred related to inventory purchases. Loyalty points vested Represent the loyalty points vested. Loyalty points used Represent the loyalty points used. Entity Address, State or Province Entity Address, City or Town Inventory, Current [Table] Loyalty points unvested Represent the loyalty points unvested. Interest expense Interest expense, net Accumulated deficit Government required severance Represent the amount of noncurrent government-required severance. Entity Address, Address Line One Loyalty points forfeited or expired Represent the loyalty points forfeited. City Area Code Commissions Expense, Policy [Policy Text Block] Local Phone Number Entity Address, Postal Zip Code us-gaap_ContractWithCustomerRefundLiability Sales reserve at beginning of period Sales reserve at end of period New commission deferrals at the end of the period Represent the amount of deferred sales commission. Title of 12(b) Security Security Exchange Name Trading Symbol Class of Stock [Axis] Revenue [Policy Text Block] Entity Common Stock, Shares Outstanding Earnings Per Share [Text Block] Director [Member] Kevin Robbins [Member] Represent notes payable to Kevin Robbins. Long-Term Debt, Maturity, Thereafter Represent the maturity payment thereafter 2026. Debt Instrument, Unsecured Notes Payable [Member] Represent the unsecured notes payable debt. Schedule of Sales Return Reserve [Table Text Block] Represent the tabular disclosure of the sales return reserve. Accrued travel expenses related to corporate events J. Stanley Frederick [Member] Represent notes payable to J. Stanley Frederick. Jade Capital [Member] Represent the notes payable to Jade Capital. Scenario [Axis] Scenario [Domain] The 2017 Stock Incentive Plan [Member] Represent the stock-based compensation plan name. Forecast [Member] Common stock, par value (in dollars per share) Investment, Name [Axis] Other income (expense), net Other (income) expense Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] us-gaap_Assets Total assets Cash and Cash Equivalents, Policy [Policy Text Block] Deferred Charges, Policy [Policy Text Block] Cash and cash equivalents Cash and Cash Equivalent Geographical [Domain] Geographical [Axis] us-gaap_CreditCardReceivables Credit Card Receivables us-gaap_AllowanceForDoubtfulAccountsReceivable Accounts Receivable, Allowance for Credit Loss Allowance for credit losses at beginning of period Allowance for credit losses at end of period Income (loss) per share - Diluted (in dollars per share) Diluted (in dollars per share) Revenue from Contract with Customer [Policy Text Block] us-gaap_ContractWithCustomerLiability Contract with Customer, Liability Total deferred revenue at beginning of the period Total deferred revenue at end of the period us-gaap_ContractWithCustomerLiabilityCurrent Deferred revenue Depreciation and amortization Total lease liabilities Represent the total of operating and finance lease liability. Total right-of-use assets Represent the total right-of-use Asset after accumulated amortization for operating and finance Leases. Accounts and Financing Receivables [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Schedule of Future Sublease Income and Minimum Lease Payments for Operating and Finance Leases [Table Text Block] Tabular disclosure of future sublease income and minimum lease payments for operating and finance Leases as of the date of the latest balance sheet presented. Consolidation, Policy [Policy Text Block] Remaining 2026, sublease Amount of future payments receivable in the remainder of the fiscal year. Associate Service Fees [Member] Represents Associate Service Fees. us-gaap_InvestmentIncomeInterest Interest income Interest paid on finance leases and other financing arrangements Lessee, Operating and Finance Leases [Text Block] The entire disclosure for finance leases and operating lease of lessee. Inventory Disclosure [Text Block] mtex_SubleaseIncomeFuturePaymentsReceivableTotal Total minimum lease payments, sublease Amount of future payments receivable total. 2028, sublease Amount of future payments receivable in year two. 2027, sublease Amount of future payments receivable in the next twelve months. Product [Member] us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted (in shares) Inventories, net Total Inventory, Net Present value of minimum lease payments, Sublease Income Represent the present value of the future payments receivable. Imputed interest, Sublease Income Amount of the imputed interest. mtex_NumberOfGeographicMarkets Number of Geographic Markets Represent the number of different geographic markets (countries or regions) where products are sold. us-gaap_StockholdersEquity Total shareholders’ equity Balance Balance Stock, Class of Stock [Table] Concentration Risk Benchmark [Axis] Nature of Operation, Product Information, Concentration of Risk [Table] us-gaap_InventoryValuationReserves Inventory Valuation Reserves Concentration Risk Benchmark [Domain] Finance leases Finance Lease, Right-of-Use Asset, after Accumulated Amortization Operating lease right-of-use assets Operating Lease, Right-of-Use Asset us-gaap_OtherLiabilitiesNoncurrent Other long-term liabilities Other Liabilities, Noncurrent ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] Net sales ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] Inventory, Policy [Policy Text Block] Commitments and contingencies (Note 8)