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Consolidated Statements of Cash Flows (Unaudited) (USD $)
9 Months Ended
Feb. 28, 2015
Feb. 28, 2014
Cash Flows from Operating Activities:    
Net income $ 31,437us-gaap_NetIncomeLoss $ 1,474,078us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,054,118us-gaap_DepreciationAndAmortization 1,008,959us-gaap_DepreciationAndAmortization
Increase in deferred tax asset (71,955)us-gaap_DeferredIncomeTaxExpenseBenefit (301,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Stock-based compensation 40,068us-gaap_ShareBasedCompensation 40,068us-gaap_ShareBasedCompensation
Changes in trade accounts receivable 1,386,863us-gaap_IncreaseDecreaseInAccountsReceivable 543,481us-gaap_IncreaseDecreaseInAccountsReceivable
Changes in related party receivable (256,425)us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties (358,746)us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties
Changes in inventory (1,322,701)us-gaap_IncreaseDecreaseInInventories (1,835,297)us-gaap_IncreaseDecreaseInInventories
Changes in prepaid expenses 41,357us-gaap_IncreaseDecreaseInPrepaidExpense (91,294)us-gaap_IncreaseDecreaseInPrepaidExpense
Changes in accounts payable and accrued expenses 929,419us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 616,053us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Other    2,785us-gaap_IncreaseDecreaseInOtherOperatingAssets
Net cash provided by operating activities 1,832,181us-gaap_NetCashProvidedByUsedInOperatingActivities 1,099,087us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash Flows from Investing Activities:    
Purchase of property and equipment (820,364)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (2,301,788)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Cash Flows from Financing Activities:    
Proceeds from long-term debt    13,337,500us-gaap_ProceedsFromIssuanceOfLongTermDebt
Proceeds from revolving loan 600,000us-gaap_ProceedsFromLoans   
Payments on long-term debt and capitalized leases (1,425,618)us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations (8,190,518)us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations
Payments on revolving loan (385,000)us-gaap_PaymentsForLoans   
Payments on notes and advances payable to related party    (92,000)us-gaap_RepaymentsOfRelatedPartyDebt
Issuance cost of long-term debt    (110,996)us-gaap_PaymentsOfDebtIssuanceCosts
Proceeds from exercised stock options 114,000us-gaap_ProceedsFromStockOptionsExercised   
Dividends paid on preferred stock (218,151)us-gaap_PaymentsOfDividends (3,469,039)us-gaap_PaymentsOfDividends
Dividends paid by variable interest entity (153,000)glgi_DistributionsByVariableInterestEntity (256,318)glgi_DistributionsByVariableInterestEntity
Net cash provided by (used in) financing activities (1,467,769)us-gaap_NetCashProvidedByUsedInFinancingActivities 1,218,629us-gaap_NetCashProvidedByUsedInFinancingActivities
Net Increase (Decrease) in Cash (455,952)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 15,928us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash, beginning of period 661,263us-gaap_CashAndCashEquivalentsAtCarryingValue 366,896us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash, end of period 205,311us-gaap_CashAndCashEquivalentsAtCarryingValue 382,824us-gaap_CashAndCashEquivalentsAtCarryingValue
Non-Cash Activities:    
Acquisition of equipment from related party 75,000glgi_AcquisitionOfEquipmentFromRelatedParty 1,087,302glgi_AcquisitionOfEquipmentFromRelatedParty
Capitalized equipment lease 32,249glgi_CapitalizedEquipmentLease   
Reduction in carrying value of equipment resulting from capital lease termination    212,312glgi_ReductionInCarryingValueOfEquipmentResultingFromCapitalLeaseTermination
Preferred dividend accrual 24,931glgi_PreferredDividendAccrual 24,932glgi_PreferredDividendAccrual
Supplemental Information:    
Interest paid $ 385,638us-gaap_InterestPaid $ 322,631us-gaap_InterestPaid