Document And Entity Information Schedule of Financing Lease [Table Text Block] Tabular disclosure of financing lease. Debt Instrument, Name [Domain] Statistical Measurement [Axis] Note To Financial Statement Details Textual Note 3 - Loss Per Share us-gaap_IncomeTaxExpenseBenefit Benefit (provision) for income taxes Note 4 - Inventory us-gaap_DebtInstrumentInterestRateStatedPercentage Debt Instrument, Interest Rate, Stated Percentage Equipment One [Member] Represents equipment one. ecd_NonRule10b51ArrTrmntdFlag Non-Rule 10b5-1 Arrangement Terminated [Flag] Note 5 - Property, Plant and Equipment ecd_NonRule10b51ArrAdoptedFlag Non-Rule 10b5-1 Arrangement Adopted [Flag] Note 7 - Long-term Debt Two Buildings [Member] Represents two buildings. Trading Arrangements, by Individual [Table] Note 8 - Leases Material Terms of Trading Arrangement [Text Block] Note 10 - Revenue and Revenue Recognition Related and Nonrelated Parties [Axis] Revenue from Contract with Customer Benchmark [Member] Note 3 - Loss Per Share - Schedule of Basic and Diluted Earnings Per Share (Details) Note 4 - Inventory - Summary of Inventory (Details) Note 5 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) Note 7 - Long-term Debt - Summary of Long-term Debt (Details) Minimum [Member] Note 7 - Long-term Debt - Summary of Long-term Debt (Details) (Parentheticals) Repurchase of common stock (in shares) Note 8 - Leases - Schedule of Financing Lease (Details) Statistical Measurement [Domain] Note 8 - Leases - Schedule of Operating Lease (Details) us-gaap_DebtInstrumentPeriodicPayment Debt Instrument, Periodic Payment Note 8 - Leases - Summary of Lease Activity (Details) Notes 8 - Leases - Summary of Liability Maturity (Details) Yorktown [Member] Represents Yorktown. Schedule of Long-Term Debt Instruments [Table] Note 10 - Revenue and Revenue Recognition - Disaggregation of Revenue (Details) Office Space Lease [Member] Represents office space lease. Notes To Financial Statements us-gaap_IncreaseDecreaseInAccountsReceivable Trade accounts receivable Grinding and Pelletizing Equipment [Member] Represents Grinding and Pelletizing Equipment. Debt Instrument [Axis] Notes To Financial Statements [Abstract] us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities Accounts payable and accrued expenses glgi_WeeklyRentalExpenses Weekly Rental Expenses Amount of weekly rental expense. Cash Flows from Operating Activities: I B C Loan Agreement [Member] Represents IBC loan agreement. Cash Flows from Investing Activities: us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash provided by operating activities Cash Flows from Financing Activities: GRE [ Member] Represents GRE. us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash used in investing activities Green Plastic Pallets [Member] Represents Green Plastic Pallets. us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash used in financing activities TriEnda Holdings LLC [Member] Represents TriEnda Holdings LLC. glgi_DebtInstrumentDebtToTangibleNetWorthRatio Debt Instrument, Debt to Tangible Net Worth Ratio Represents debt to tangible net worth ratio under debt instrument. glgi_DebtInstrumentDebtServiceCoverageRatio Debt Instrument, Debt Service Coverage Ratio Represents debt service coverage ratio under debt instrument. glgi_DepreciationExpenseIncludingAmortizationRelatedToFinancingLeases Depreciation Expense, Including Amortization Related to Financing Leases Amount of depreciation expense including amortization expense related to financing leases. Accounting Policies [Abstract] us-gaap_LesseeOperatingLeaseDiscountRate Lessee, Operating Lease, Discount Rate Leasehold Improvements [Member] Income Statement [Abstract] us-gaap_IncreaseDecreaseInInventories Inventory us-gaap_SharesOutstanding Balances (in shares) Balances (in shares) Change in deferred taxes us-gaap_ContractualObligation Contractual Obligation us-gaap_TreasuryStockCommonShares Balances (in shares) Balances (in shares) Treasury Stock, Common [Member] Net loss Net loss Adjustments to reconcile net loss to net cash provided by (used in) operating activities Preferred stock, $0.0001 par value, cumulative, 20,750,000 shares authorized; -0- shares issued and outstanding at August 31, 2026 and May 31, 2026 Net income (loss) attributable to common stockholders Net loss attributable to common stockholders us-gaap_Liabilities Total Liabilities us-gaap_AmortizationOfFinancingCosts Amortization of Debt Issuance Costs us-gaap_LiabilitiesAndStockholdersEquity Total Liabilities and Equity us-gaap_IncreaseDecreaseInPrepaidExpense Prepaid expenses Selling, General and Administrative Expenses Lessee, Lease, Description [Table] Lease Contractual Term [Axis] glgi_DebtInstrumentCovenantDividendsAndDistributions Debt Instrument, Covenant, Dividends and Distributions Represents the amount of dividends and distributions that can be made and stay in compliance with a debt covenant. Lease Contractual Term [Domain] glgi_DebtInstrumentCovenantInterestPaymentsOnRelatedPartyDebt Debt Instrument, Covenant, Interest Payments on Related Party Debt Represents the amount of interest payments on related party debt that can be made and stay in compliance with a debt covenant. Effects of changes in operating assets and liabilities: glgi_DebtInstrumentDebtToEBITDARatio Debt Instrument, Debt to EBITDA Ratio Represents the debt to EITDA ratio for a debt instrument. glgi_DebtInstrumentCovenantCapitalExpenditures Debt Instrument, Covenant, Capital Expenditures Represents the amount of capital expenditures that can be made and stay in compliance with a debt covenant. Accounting Standards Update and Change in Accounting Principle [Table] us-gaap_PreferredStockSharesIssued Preferred Stock, Shares Issued (in shares) us-gaap_PreferredStockSharesOutstanding Preferred Stock, Shares Outstanding (in shares) us-gaap_PreferredStockSharesAuthorized Preferred Stock, Shares Authorized (in shares) us-gaap_PreferredStockParOrStatedValuePerShare Preferred Stock, Par or Stated Value Per Share (in dollars per share) us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect Net (Decrease) Increase in Cash Related and Nonrelated Parties [Domain] us-gaap_DeferredFinanceCostsNet Debt issuance costs, net of amortization us-gaap_TreasuryStockValueAcquiredCostMethod Repurchase of common stock Change in Reporting Entity [Table] Related Party Transaction [Table] Related Party Transactions Disclosure [Text Block] us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations Cash, beginning of period Cash, end of period Antidilutive Securities, Name [Domain] Statement [Table] Current portion of revolver loan us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties Related parties receivable Operating cash flows us-gaap_OperatingLeasePayments Operating Lease, Payments Credit Facility [Axis] Credit Facility [Domain] Revolving Credit Facility [Member] Prepaid expenses Other income (expense): us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 Debt Instrument, Basis Spread on Variable Rate Statement of Financial Position [Abstract] Equipment Acquisition [Member] Related to equipment acquisition. glgi_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareValue Antidilutive Securities Excluded from Computation of Earnings Per Share, Value Value of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. Financing cash flows Finance Lease, Principal Payments us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity Line of Credit Facility, Maximum Borrowing Capacity us-gaap_LesseeFinanceLeaseTermOfContract1 Lessee, Finance Lease, Term of Contract Long-Term Debt, Type [Axis] Financing leases (Year) us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1 Product and Service [Domain] Product and Service [Axis] 2031, operating leases us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization Production equipment under financing leases, net us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue Total future minimum lease payments, operating lease Thereafter, operating lease us-gaap_PaymentsForRepurchaseOfCommonStock Repurchase of common stock Approximately [Member] Represents the Approximately of the value Production equipment under financing leases us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization Less: Accumulated amortization Warrant [Member] Financing leases us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent Financing Obligation [Member] Represents the financing obligations. glgi_EstimatedAdditionalCosts Estimated Additional Costs The amount of unexpected or expected value of estimated additional costs. Operating leases us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent dei_DocumentType Document Type Document Information [Line Items] Document Quarterly Report Percentage Concentration Risk, Percentage us-gaap_LesseeOperatingLeaseTermOfContract Lessee, Operating Lease, Term of Contract us-gaap_LesseeOperatingLeaseRenewalTerm Lessee, Operating Lease, Renewal Term Operating leases (Year) us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1 2028, operating leases Document Information [Table] 2027, operating leases 2030, operating leases 2029, operating leases us-gaap_DeferredRevenueCurrent Deferred Revenue, Current Incremental shares from assumed conversion of options warrants, as appropriate (in shares) us-gaap_OperatingLeaseExpense Operating Lease, Expense Antidilutive Securities [Axis] dei_EntityInteractiveDataCurrent Entity Interactive Data Current Document Transition Report Diluted (in shares) Weighted average common stock outstanding - diluted (in shares) Statement [Line Items] Common Stock, Shares, Issued (in shares) Net loss per share of common stock - Purchase Commitment, Excluding Long-Term Commitment [Domain] Common Stock, Shares, Outstanding (in shares) glgi_MonthlyRentExpenseAnnualIncreasePercentage Monthly Rent Expense, Annual Increase, Percentage Represents the percentage of increase in monthly rent on an annual basis. us-gaap_CommonStockSharesAuthorized Common Stock, Shares Authorized (in shares) Purchase Commitment, Excluding Long-Term Commitment [Axis] Basic (in shares) Lessee, Leases [Text Block] The entire disclosure for leases including operating and financing leases. earnings (loss) per share of common stock - basic (in dollars per share) Basic (in dollars per share) Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Common stock, $0.0001 par value, 5,000,000,000 shares authorized; 27,270,701 shares issued and outstanding at August 31, 2026 and May 31, 2026 glgi_DebtInstrumentDebtToTangibleNetWorthRatioDecreaseEachYear Debt Instrument, Debt to Tangible Net Worth Ratio, Decrease Each Year Amount of decrease each year for debt to tangible net worth ratio. Amortization of right-of-use assets Finance Lease, Right-of-Use Asset, Amortization glgi_FinanceLeaseEffectiveInterestRate Finance Lease, Effective Interest Rate The effective interest rate from the finance lease. Schedule of Inventory, Current [Table Text Block] us-gaap_FinanceLeaseLiability Finance Lease, Liability us-gaap_PolicyTextBlockAbstract Accounting Policies us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements us-gaap_TableTextBlock Notes Tables Document Fiscal Period Focus Customer [Domain] Document Fiscal Year Focus Commitments Disclosure [Text Block] Finance Obligation Amendment Flag Current portion of long-term debt Schedule of Operating Lease [Table Text Block] Tabular disclosure of operating lease. Common Stock [Member] Concentration Risk [Table] Concentration Risk Type [Axis] us-gaap_ProceedsFromIssuanceOfLongTermDebt Proceeds from Issuance of Long-Term Debt dei_DocumentPeriodEndDate Document Period End Date Concentration Risk Disclosure [Text Block] Nonrelated Party [Member] Property, Plant, and Equipment [Text Block] Interest on lease liabilities Long-Lived Asset, Class [Domain] Operating cash flows Legal Entity [Axis] Related Party [Member] Operating lease expense us-gaap_OperatingLeaseCost Short-term lease expense Construction in Progress [Member] us-gaap_LeaseCost Total Finance Lease, Liability, to be Paid, Maturity [Table Text Block] Operating lease expense us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount Present value discount, operating lease dei_EntityFileNumber Entity File Number Operating Leases, net of current portion Entity Tax Identification Number Non-Cash Activities: Liability under operating leases Current portion of operating leases Less: Current portion Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table] Entity [Domain] Entity Central Index Key Entity Registrant Name dei_EntityCurrentReportingStatus Entity Current Reporting Status Accounts Receivable [Member] Entity Incorporation, State or Country Code us-gaap_LongTermDebtCurrent Less: Current portion of long-term debt Current Fiscal Year End Date Bin Processing [Member] Relating to the bin processing services. Concentration Risk Type [Domain] glgi_MonthlyRentExpense Monthly Rent Expense Amount of monthly rent expense. glgi_MonthlyRentExpenseMonthlyIncreaseEveryFifthYearPercent Monthly Rent Expense, Monthly Increase Every Fifth Year, Percent Amount of increase of monthly rent expense every fifth year as percentage. Long-term debt, net of current portion Entity Filer Category dei_EntityShellCompany Entity Shell Company Entity Emerging Growth Company Entity Small Business us-gaap_OperatingIncomeLoss Gain on Involuntary Conversions (Note 4) Cash Cash glgi_MonthlyRentalExpenseRenewal Monthly Rental Expense, Renewal The amount of monthly rental expense effective for renewal of lease. Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] us-gaap_LongTermDebt Total debt, net of debt issuance costs Long-Term Debt Entity Address, State or Province Statement of Stockholders' Equity [Abstract] Entity Address, City or Town Inventory, Current [Table] Accumulated deficit Retained Earnings (Accumulated Deficit) Entity Address, Address Line One Statement of Cash Flows [Abstract] City Area Code Local Phone Number Entity Address, Postal Zip Code glgi_DebtInstrumentCovenantMaximumAmountOfUnauthorizedDistributions Debt Instrument, Covenant, Maximum Amount of Unauthorized Distributions Represents the maximum amount of unauthorized distributions that the company can make as part of a debt covenant. Revenue from Contract with Customer [Text Block] Preferred Stock [Member] Long-Term Debt, Type [Domain] Equity Components [Axis] Term Loan to International Bank of Commerce [Member] Relating to term loans to International Bank of Commerce. Revolving loan to International Bank of Commerce [Member] Relating to revolving loan to International Bank of Commerce. us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent Accounts payable and accrued expenses Corporate Offices [Member] Relating to corporate offices. Class of Stock [Axis] Equity Component [Domain] Related Party Transaction [Domain] glgi_PrimeRate Prime Rate Percentage of prime rate. Term Loan to First Interstate Bank [Member] Relating to term loan to First Interstate Bank. dei_EntityCommonStockSharesOutstanding Entity Common Stock, Shares Outstanding (in shares) Additional Paid-in Capital [Member] Retained Earnings [Member] Related Party Transaction [Axis] Earnings Per Share [Text Block] Cost of Sales Property, Plant and Equipment, net Net Property, Plant and Equipment Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization us-gaap_InterestExpenseOther Interest expense Property, Plant and Equipment, Gross Financial Instruments Disclosure [Text Block] Capital expenditures in accounts payable Scenario [Axis] Scenario [Domain] Forecast [Member] Weighted average shares of common stock outstanding Machinery and Equipment [Member] Property, Plant, and Equipment [Table] us-gaap_CommonStockParOrStatedValuePerShare Common Stock, Par or Stated Value Per Share (in dollars per share) Sale Leaseback Transaction, Name [Domain] Furniture and Fixtures [Member] Other income us-gaap_SaleLeasebackTransactionNetBookValue Sale Leaseback Transaction, Net Book Value glgi_DebtInstrumentCovenantMaximumStockRepurchase Debt Instrument, Covenant, Maximum Stock Repurchase Amount of maximum stock repurchase under the covenant of the debt instrument. Long-Lived Asset, Class [Axis] us-gaap_Assets Total Assets us-gaap_SaleLeasebackTransactionLeaseTerm Sale Leaseback Transaction, Lease Term (Year) Deferred Tax Liability Sale Leaseback Transaction, Description [Axis] Geographical [Domain] Geographical [Axis] Supplemental Information: us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty Related Party Transaction, Purchases from Related Party us-gaap_AccountsReceivableNet Accounts Receivable, after Allowance for Credit Loss Current Liabilities: us-gaap_LiabilitiesCurrent Total Current Liabilities Loss per share of common stock - diluted (in dollars per share) Diluted (in dollars per share) Customer [Axis] us-gaap_ContractWithCustomerLiabilityCurrent Deferred revenue Accounts Receivable Depreciation and amortization Customer Concentration Risk [Member] Lease, Cost [Table Text Block] Major Customer Lost [Member] The major customer that was lost. Interest paid Revenue Benchmark [Member] Inventory Disclosure [Text Block] Long-Term Debt [Text Block] Other Commitments [Table] Schedule of Long-Term Debt Instruments [Table Text Block] us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment Less: Accumulated depreciation and amortization Finished goods Inventory Total inventory Basis of Accounting [Text Block] us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest Loss before income taxes Last Major Customers [Member] Represents the Last Major Customers. Financial Instrument Subject to Mandatory Redemption [Table] Raw materials Durakon Industries, Inc. [Member] Represents the company Durakon Industries, Inc. glgi_LeaseRentalEscalationPercent Lease Rental Escalation, Percent The percent of rental escalation for the lease agreement. Lease Agreement With Robert Rosene [Member] Relating to the lease agreement with Robert Rosene. Additional paid-in capital glgi_RepaymentsOfLongTermDebtAndFinanceLease Principal payments on long-term debt and financing leases The cash outflow for finance lease and debt initially having maturity due after one year or beyond the normal operating cycle, if longer. us-gaap_StockholdersEquity Total Equity Balances Balances Going Concern and Management's Plan [Text Block] The entire disclosure of the going concern and management's plan. Plant Buildings and Land [Member] Represents Plant Buildings and Land. us-gaap_PaymentsOfDividends Dividends paid on preferred stock us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Purchase of property, plant and equipment Long-Term Debt, Gross Total Concentration Risk Benchmark [Axis] Deferred Revenue [Text Block] The entire disclosure for deferred revenues at the end of the reporting period, and description and amounts of significant changes that occurred during the reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.{VALUE} Non-US [Member] Concentration Risk Benchmark [Domain] Pallets [Member] Represents pallets. Distributors [Member] Represents distributors. End User Customers [Member] Represents end user customers. Current Assets: Right-to-use Assets us-gaap_AssetsCurrent Total Current Assets Sales Revenue from Contract with Customer, Excluding Assessed Tax ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] Property, Plant, and Equipment [Table Text Block] us-gaap_GrossProfit Gross Profit us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax Related Party Transaction, Purchases from Related Party ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] Two Customers [Member] Represents two customers. Revenue, Product and Service Benchmark [Member]