Document And Entity Information Statistical Measurement [Axis] Note To Financial Statement Details Textual us-gaap_IncomeTaxExpenseBenefit Benefit (Provision) for Income Taxes Provision for income taxes Significant Accounting Policies ecd_NonRule10b51ArrTrmntdFlag Non-Rule 10b5-1 Arrangement Terminated [Flag] Note 1 - Summary of Significant Accounting Policies Non-Rule 10b5-1 Arrangement Adopted [Flag] Note 3 - Earnings (Loss) Per Share Trading Arrangements, by Individual [Table] Note 4 - Inventory Material Terms of Trading Arrangement [Text Block] Retirement Benefits [Text Block] Note 5 - Property, Plant and Equipment Insider Trading Policies and Procedures Adopted [Flag] Insider Trading Policies and Procedures Adopted [Flag] Revenue from Contract with Customer Benchmark [Member] Note 6 - Long-term Debt Note 7 - Leases Note 8 - Revenue Note 10 - Income Taxes Minimum [Member] Note 14 - Supplemental Information of Cash Flows Note 1 - Summary of Significant Accounting Policies - Summary of Useful Life of Property Plant and Equipment (Details) Insider Trading Policies and Procedures [Line Items] Statistical Measurement [Domain] Note 3 - Earnings (Loss) Per Share - Schedule of Basic and Diluted Earnings Per Share (Details) Maximum [Member] Note 4 - Inventory - Summary of Inventory (Details) Note 5 - Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) Note 6 - Long-term Debt - Summary of Long-term Debt (Details) Retirement Plan Name [Domain] Note 6 - Long-term Debt - Summary of Long-term Debt (Details) (Parentheticals) us-gaap_IncreaseDecreaseInAccountsReceivable Trade accounts receivable Note 7 - Leases - Schedule of Financing Lease (Details) us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities Accounts payable and accrued expenses Retirement Plan Name [Axis] Note 7 - Leases - Schedule of Operating Lease (Details) Note 7 - Leases - Summary of Lease Activity (Details) Notes 7 - Leases - Summary of Liability Maturity (Details) Note 8 - Revenue (Details) Note 10 - Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) Note 10 - Income Taxes - Summary of Changes in Deferred Tax (Details) Note 10 - Income Taxes - Summary of Income Tax Expense (Details) Note 10 - Income Taxes - Reconciliation of Effective Income Tax Rate (Details) Note 14 - Supplemental Information of Cash Flows - Schedule of Cash Flows (Details) Notes To Financial Statements Notes To Financial Statements [Abstract] us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate Provision to Return Adjustment us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent us-gaap_EffectiveIncomeTaxRateContinuingOperations Tax (benefit) provision per consolidated financial statements us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate Tax (benefit) provision using statutory rates Income Tax Jurisdiction [Domain] us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense Permanent differences us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount Valuation allowance us-gaap_LesseeOperatingLeaseDiscountRate Lessee, Operating Lease, Discount Rate Leasehold Improvements [Member] us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes State income taxes (benefits) us-gaap_IncreaseDecreaseInInventories Inventory us-gaap_SharesOutstanding Balances (in shares) Balances (in shares) us-gaap_IncreaseDecreaseInOtherReceivables Other accounts receivable Adjustments to reconcile net income (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 in 2026 and 2025; liquidation preference of $0 in 2026 and 2025 us-gaap_Liabilities Total Liabilities Defined Benefit Plan [Table] us-gaap_LiabilitiesAndStockholdersEquity Total Liabilities and Equity us-gaap_IncreaseDecreaseInPrepaidExpense Prepaid expenses Selling, General and Administrative Expenses Subsequent Event [Member] Lessee, Lease, Description [Table] us-gaap_PreferredStockDividendsAndOtherAdjustments Preferred Dividends Lease Contractual Term [Axis] Lease Contractual Term [Domain] Effects of changes in operating assets and liabilities: 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) Fair Value, by Balance Sheet Grouping [Table] us-gaap_PreferredStockParOrStatedValuePerShare Preferred Stock, Par or Stated Value Per Share (in dollars per share) us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect Net Decrease in Cash glgi_PaymentsForRetirementOfPreferredStock Payments For Retirement of Preferred Stock The cash outflow for retirement of preferred stock New Accounting Pronouncements, Policy [Policy Text Block] us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations Cash, beginning of period Cash, end of period Antidilutive Securities, Name [Domain] Statement [Table] Reclassification, Comparability Adjustment [Policy Text Block] Current portion of revolving loan us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties Related parties receivable Credit Facility [Axis] Operating cash flows us-gaap_OperatingLeasePayments Operating Lease, Payments Credit Facility [Domain] Revolving Credit Facility [Member] Prepaid expenses us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 Debt Instrument, Basis Spread on Variable Rate glgi_PolicyTable Financing cash flows Finance Lease, Principal Payments us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity Line of Credit Facility, Maximum Borrowing Capacity us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent Long-Term Debt, Type [Axis] Property, Plant, And Equipment, Useful Life (Year) 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 Production equipment under financing leases us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization Less: Accumulated amortization us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent Financing leases us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent Operating leases 2028, operating leases 2027, operating leases 2030, operating leases 2029, operating leases us-gaap_OperatingLeaseExpense Operating Lease, Expense Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Statement [Line Items] Plant Building [Member] Represents Plant Building. Schedule of Useful Life of Property Plant and Equipment [Table Text Block] Tabular disclosure of useful life of property plant and equipment. Common Stock, Shares, Issued (in shares) glgi_NetChangesInDeferredCharges Deferred rent adjustments Represents the increase decrease in deferred charges. Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] 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. Schedule of Deferred Tax Assets and Liabilities [Table Text Block] us-gaap_CommonStockSharesAuthorized Common Stock, Shares Authorized (in shares) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Retired Preferred Stock [Member] Relating to retired preferred stock. Preferred dividend accrual Common stock, $0.0001 par value, 5,000,000,000 shares authorized; 27,270,701 and 27,879,701 shares issued in 2026 and 2025; 27,270,701 and 27,360,577 shares outstanding in 2026 and 2025 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. glgi_TreasurySharesCommonSharesRetired Retirement of treasury shares (in shares) Represents the number of common shares retired. 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_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 Class of Warrant or Right, Exercise Price of Warrants or Rights us-gaap_FinanceLeaseLiability Non-cancelable financing leases us-gaap_PolicyTextBlockAbstract Accounting Policies us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements us-gaap_TableTextBlock Notes Tables Advances under revolving loan Finance Obligation Non-cancelable financing leases, net of current portion Current portion of long-term debt Current portion of financing leases Less: Current portion Schedule of Operating Lease [Table Text Block] Tabular disclosure of operating lease. Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Concentration Risk [Table] Concentration Risk Type [Axis] Proceeds from finance obligation Proceeds from Issuance of Long-Term Debt Concentration Risk Disclosure [Text Block] Nonrelated Party [Member] Interest on lease liabilities Operating cash flows Preferred dividends payable Related Party [Member] Significant Accounting Policies [Text Block] Operating leases us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount Present value discount, operating lease glgi_PreferredStockStatedValuePerShare Preferred Stock, Stated Value Per Share Stated value per share for preferred stock. Operating Leases, net of current portion glgi_DefinedContributionPlanEmployerMatchingContributionPercentOfMatchTrancheTwo Defined Contribution Plan, Employer Matching Contribution, Percent of Match, Tranche Two Percentage employer matches of the employee's percentage contribution matched, tranche two. Liability under operating leases Current portion of operating leases Less: Current portion glgi_DefinedContributionPlanEmployerMatchingContributionPercentOfMatchTrancheOne Defined Contribution Plan, Employer Matching Contribution, Percent of Match, Tranche One Percentage employer matches of the employee's percentage contribution matched, tranche one. Summary of Net Change in Deferred Taxes [Table Text Block] Tabular disclosure of net changes in deferred taxes. glgi_NetChangesInDepreciationAndAmortizationInExcessOfFinancial Depreciation and amortization, tax reporting in excess of financial Amount of net changes in depreciation and amortization in excess of financial. Accounts Receivable [Member] glgi_NetChangesInNetOperatingLossCarryforward Net operating loss carryforward Amount of increase or decrease in net operating loss carryforward. us-gaap_LongTermDebtCurrent Less: Current portion of long-term debt Concentration Risk Type [Domain] glgi_MonthlyRentExpense Monthly Rent Expense Amount of monthly rent expense. Long-Term Debt, net of current portion and debt issuance costs glgi_MonthlyRentExpenseMonthlyIncreaseEveryFifthYearPercent Monthly Rent Expense, Monthly Increase Every Fifth Year, Percent Amount of increase of monthly rent expense every fifth year as percentage. glgi_NetChangesInDeferredTaxOther Other Amount of net changes in deferred tax, other. Proceeds from disposal of property, plant and equipment glgi_ContractWithCustomerLiabilityRevenueRecognizedIncludingOpeningBalance Contract with Customer, Liability, Revenue Recognized Including Opening Balance Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due including opening balance. us-gaap_LongTermDebt Total debt, net of debt issuance costs Long-Term Debt Fire [Member] Statement of Stockholders' Equity [Abstract] Loss Contingencies [Table] Class of Warrant or Right [Axis] Statement of Cash Flows [Abstract] Class of Warrant or Right [Domain] us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion Convertible Preferred Stock, Shares Issued upon Conversion Long-Term Debt, Type [Domain] Equity Components [Axis] Equity Component [Domain] us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights Class of Warrant or Right, Number of Securities Called by Warrants or Rights Equity [Text Block] Additional Paid-in Capital [Member] Retained Earnings [Member] Cost of Sales Property, Plant and Equipment, net Net Property, Plant and Equipment Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Property, Plant and Equipment, Gross Financial Instruments Disclosure [Text Block] Equipment purchases in accounts payable Subsequent Event Type [Domain] Subsequent Event Type [Axis] Property, Plant, and Equipment [Policy Text Block] Machinery and Equipment [Member] Furniture and Fixtures [Member] Equity: Deferred Tax Liability us-gaap_AccountsReceivableNet Accounts Receivable, after Allowance for Credit Loss Current Liabilities: us-gaap_LiabilitiesCurrent Total Current Liabilities Federal State Accounts Receivable Customer Concentration Risk [Member] us-gaap_PreferredStockLiquidationPreference Preferred Stock, Liquidation Preference Per Share (in dollars per share) Lease, Cost [Table Text Block] Major Customer Lost [Member] The major customer that was lost. us-gaap_GainLossOnDispositionOfAssets1 (Gain) loss on disposition of assets Revenue Benchmark [Member] Lessee, Leases [Policy Text Block] Long-Term Debt [Text Block] us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment Less: Accumulated depreciation and amortization us-gaap_PreferredStockConvertibleConversionPrice Preferred Stock, Convertible, Conversion Price Equipment purchases transferred to inventory Future cash outflow to pay for purchases of equipment that have occurred. us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest Income (Loss) before Income Taxes Last Major Customers [Member] Represents the Last Major Customers. 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. Noncash or Part Noncash Acquisitions [Table] Use of Estimates, Policy [Policy Text Block] Plant Buildings and Land [Member] Represents Plant Buildings and Land. us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Purchase of property, plant and equipment us-gaap_StockIssuedDuringPeriodValueNewIssues Stock Issued During Period, Value, New Issues Long-Term Debt, Gross Total us-gaap_StockRepurchasedAndRetiredDuringPeriodValue Retirement of preferred stock Distributors [Member] Represents distributors. End User Customers [Member] Represents end user customers. Current Assets: us-gaap_AssetsCurrent Total Current Assets us-gaap_GrossProfit Gross Profit Two Customers [Member] Represents two customers. us-gaap_StockIssuedDuringPeriodSharesNewIssues Stock Issued During Period, Shares, New Issues Schedule of Financing Lease [Table Text Block] Tabular disclosure of financing lease. Debt Instrument, Name [Domain] us-gaap_DebtInstrumentInterestRateStatedPercentage Debt Instrument, Interest Rate, Stated Percentage Equipment One [Member] Represents equipment one. Two Buildings [Member] Represents two buildings. Equipment Two [Member] Represents equipment two. Related and Nonrelated Parties [Axis] Class of Stock [Domain] us-gaap_StockRepurchasedAndRetiredDuringPeriodShares Retirement of preferred stock (in shares) Repurchase of common stock (in shares) us-gaap_DebtInstrumentPeriodicPayment Debt Instrument, Periodic Payment Schedule of Long-Term Debt Instruments [Table] Yorktown [Member] Represents Yorktown. Office Space Lease [Member] Represents office space lease. Cash Flow, Supplemental Disclosures [Text Block] Debt Instrument [Axis] Grinding and Pelletizing Equipment [Member] Represents Grinding and Pelletizing Equipment. 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_TreasuryStockSharesRetired Treasury Stock, Shares, Retired us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash (used in) 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 provided by (used in) financing activities us-gaap_InventoryFinishedGoodsNetOfReserves Inventory, Finished Goods, Net of Reserves 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] Accounts Receivable [Policy Text Block] Income Statement [Abstract] Change in deferred taxes us-gaap_TreasuryStockCommonValue Treasury Stock, at cost, 0 and 519,124 shares at 2026 and 2025 us-gaap_PurchaseObligation Purchase Obligation Treasury Stock, Common, Shares (in shares) Balances (in shares) Balances (in shares) Treasury Stock, Common [Member] Net loss Net Income (Loss) Net income (loss) attributable to common stockholders Net Income (Loss) Attributable to Common Stockholders us-gaap_AmortizationOfFinancingCosts Amortization of Debt Issuance Costs Unusual or Infrequent Item, or Both [Domain] Unusual or Infrequent Item, or Both [Axis] us-gaap_DeferredTaxAssetsGross Total deferred tax asset Income Tax Disclosure [Text Block] 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. 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. glgi_DebtInstrumentDebtToEBITDARatio Debt Instrument, Debt to EBITDA Ratio Represents the debt to EITDA ratio for a debt instrument. us-gaap_DeferredTaxAssetsOperatingLossCarryforwards Net operating loss carryforward us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate Provision to Return Adjustment 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] Income Tax, Policy [Policy Text Block] Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Tax (benefit) provision using statutory rates us-gaap_DeferredTaxAssetsOther Other Related and Nonrelated Parties [Domain] us-gaap_DeferredFinanceCostsNet Debt issuance costs, net of amortization us-gaap_TreasuryStockValueAcquiredCostMethod Repurchase of common stock us-gaap_IncomeTaxReconciliationNondeductibleExpense Permanent differences Related Party Transaction [Table] Related Party Transactions Disclosure [Text Block] us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes State income taxes (benefits) us-gaap_DeferredTaxLiabilitiesDeferredExpense Deferred rent adjustments Other Income (Expense): Statement of Financial Position [Abstract] us-gaap_DeferredTaxAssetsValuationAllowance Valuation allowance Deferred Tax Assets, Valuation Allowance Income taxes paid us-gaap_DividendsPreferredStock Preferred dividends us-gaap_DeferredTaxLiabilities Net deferred tax liability us-gaap_LesseeFinanceLeaseTermOfContract1 Lessee, Finance Lease, Term of Contract glgi_PreferredStockDividendRateBasisSpreadPercentage Preferred Stock, Dividend Rate, Basis Spread, Percentage The basis spread percentage for a preferred stock dividend rate. Financing leases (Year) us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1 us-gaap_DeferredTaxLiabilitiesOther Other us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock Payments for retirement of preferred stock us-gaap_PaymentsForRepurchaseOfCommonStock Repurchase of common stock Approximately [Member] Represents the Approximately of the value us-gaap_DeferredRevenue Deferred Revenue Financing Obligation [Member] Represents the financing obligations. glgi_EstimatedAdditionalCosts Estimated Additional Costs The amount of unexpected or expected value of estimated additional costs. us-gaap_IncreaseDecreaseInDeferredIncomeTaxes Net change dei_DocumentType Document Type Document Information [Line Items] Percentage Concentration Risk, Percentage us-gaap_LesseeOperatingLeaseTermOfContract Lessee, Operating Lease, Term of Contract (Month) us-gaap_DefinedContributionPlanCostRecognized Defined Contribution Plan, Cost dei_DocumentAnnualReport Document Annual Report us-gaap_LesseeOperatingLeaseRenewalTerm Lessee, Operating Lease, Renewal Term Operating leases (Year) us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1 Document Information [Table] Incremental shares from assumed conversion of options warrants, as appropriate (in shares) us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive Securities [Axis] dei_EntityInteractiveDataCurrent Entity Interactive Data Current dei_DocumentTransitionReport Document Transition Report Diluted (in shares) us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding Weighted average common stock outstanding - diluted (in shares) dei_DocumentFinStmtErrorCorrectionFlag Document Financial Statement Error Correction [Flag] Net Earnings (Loss) Per Share of Common Stock - Basic (in shares) Weighted-average shares outstanding - basic (in shares) Lessee, Leases [Text Block] The entire disclosure for leases including operating and financing leases. us-gaap_TreasuryStockRetiredCostMethodAmount Retirement of treasury shares Basic (in dollars per share) Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Effective Income Tax Rate Reconciliation [Table] us-gaap_TaxJurisdictionOfDomicileExtensibleEnumeration Tax Jurisdiction of Domicile [Extensible Enumeration] Earnings Per Share, Policy [Policy Text Block] dei_IcfrAuditorAttestationFlag ICFR Auditor Attestation Flag Document Fiscal Period Focus Customer [Domain] Document Fiscal Year Focus Commitments Disclosure [Text Block] Amendment Flag Common Stock [Member] dei_DocumentPeriodEndDate Document Period End Date Building [Member] Property, Plant, and Equipment [Text Block] Long-Lived Asset, Class [Domain] Legal Entity [Axis] Operating lease expense us-gaap_OperatingLeaseCost Short-term lease expense Construction in Progress [Member] us-gaap_LeaseCost Total dei_EntityFileNumber Entity File Number Entity Tax Identification Number Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table] Entity [Domain] Entity Central Index Key Entity Registrant Name dei_EntityWellKnownSeasonedIssuer Entity Well-known Seasoned Issuer glgi_PaymentsForRetirementOfCommonStock Repurchase and retirement of common stock The cash outflow related to the retirement of common stock. dei_EntityCurrentReportingStatus Entity Current Reporting Status dei_EntityVoluntaryFilers Entity Voluntary Filers Common Stock Retired [Member] Represents common stock retired. Entity Incorporation, State or Country Code Current Fiscal Year End Date dei_EntityPublicFloat Entity Public Float Entity Filer Category us-gaap_PreferredStockDividendsPerShareDeclared Preferred Stock, Dividends Per Share, Declared (in dollars per share) dei_EntityShellCompany Entity Shell Company Entity Emerging Growth Company Entity Small Business us-gaap_OperatingIncomeLoss Operating Income (Loss) Cash Cash Warrants Exercisable Into Common Stock [Member] Warrants Exercisable Into Common Stock. 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] Entity Address, State or Province Entity Address, City or Town Inventory, Current [Table] Accumulated deficit Retained Earnings (Accumulated Deficit) Canada and Mexico [Member] Related to Canada and Mexico. Entity Address, Address Line One us-gaap_GainOnBusinessInterruptionInsuranceRecovery Gain on Involuntary Conversions (Note 5) Gain on Business Interruption Insurance Recovery Non-cancellable Leases [Member] Related to non-cancellable leases. City Area Code Local Phone Number Series 2003 Preferred Stock [Member] Represents Series 2003 preferred stock. 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] Electrical Storm [Member] In reference to an electrical storm. glgi_DefinedContributionPlanEmployerMatchingContributionPercentOfEmployeesGrossPayTrancheTwo Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay, Tranche Two Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. Term Loan to International Bank of Commerce [Member] Relating to term loans to International Bank of Commerce. glgi_DefinedContributionPlanEmployerMatchingContributionPercentOfEmployeesGrossPayTrancheOne Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay, Tranche One Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. Revolving loan to International Bank of Commerce [Member] Relating to revolving loan to International Bank of Commerce. glgi_DefinedContributionPlanVestingPeriod Defined Contribution Plan, Vesting Period Period of vesting under defined contribution plan. The 401(k) Plan [Member] Represents the 401(k) plan. us-gaap_AccountsPayableAndOtherAccruedLiabilitiesCurrent Accounts payable and accrued expenses Class of Stock [Axis] Corporate Offices [Member] Relating to corporate offices. glgi_PrimeRate Prime Rate Percentage of prime rate. Related Party Transaction [Domain] Title of 12(g) Security Term Loan to First Interstate Bank [Member] Relating to term loan to First Interstate Bank. dei_EntityCommonStockSharesOutstanding Entity Common Stock, Shares Outstanding (in shares) Related Party Transaction [Axis] Earnings Per Share [Text Block] us-gaap_InterestExpenseOther Interest Expense Scenario [Axis] Scenario [Domain] Forecast [Member] Weighted Average Shares of Common Stock Outstanding 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] 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 Cash and Cash Equivalents, Policy [Policy Text Block] Sale Leaseback Transaction, Description [Axis] dei_AuditorFirmId Auditor Firm ID dei_AuditorName Auditor Name us-gaap_InsuranceSettlementsReceivable Insurance Settlements Receivable Geographical [Domain] dei_AuditorLocation Auditor Location Geographical [Axis] us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty Related Party Transaction, Purchases from Related Party us-gaap_AllowanceForDoubtfulAccountsReceivable Accounts Receivable, Allowance for Credit Loss us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage Earnings (loss) per share of common stock - diluted (in dollars per share) us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Revenue from Contract with Customer [Policy Text Block] us-gaap_ContractWithCustomerLiability Contract with Customer, Liability Customer [Axis] us-gaap_ContractWithCustomerLiabilityCurrent Deferred revenue Depreciation and amortization Debt, Policy [Policy Text Block] Other Significant Noncash Transactions [Table] Consolidation, Policy [Policy Text Block] Interest paid Inventory Disclosure [Text Block] Schedule of Long-Term Debt Instruments [Table Text Block] Finished goods Inventory Total inventory glgi_NumberOfCustomers Number of Customers Represents the number of customers. Raw materials Durakon Industries, Inc. [Member] Represents the company Durakon Industries, Inc. Lease Agreement With Robert Rosene [Member] Relating to the lease agreement with Robert Rosene. us-gaap_StockholdersEquity Total Equity Balances Balances us-gaap_IncreaseDecreaseInContractWithCustomerLiability Deferred revenue Going Concern and Management's Plan [Text Block] The entire disclosure of the going concern and management's plan. Award Timing Method [Text Block] ecd_AwardTmgMnpiCnsdrdFlag Award Timing MNPI Considered [Flag] us-gaap_PaymentsOfDividends Dividends paid on preferred stock Stock, Class of Stock [Table] Award Timing Disclosures [Line Items] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Right-to-use Assets Sales Revenue from Contract with Customer, Excluding Assessed Tax ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment Depreciation and amortization recognized for tax in excess of financial Property, Plant, and Equipment [Table Text Block] ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax Related Party Transaction, Purchases from Related Party Commitments and Contingencies Inventory, Policy [Policy Text Block] Revenue, Product and Service Benchmark [Member] us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount