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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 31, 2011
Cash flows from operating activities  
Net income $ 10,833,215us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Adjustments to reconcile net income (loss) to net cash provided by operating activities:  
Depreciation and amortization 19,214,069us-gaap_DepreciationAndAmortization
Gain on disposal of property and equipment (441,524)us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Stock-based compensation 483,769us-gaap_ShareBasedCompensation
Deferred income taxes 2,469,953us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in operating assets and liabilities  
Trade accounts receivable (2,442,223)us-gaap_IncreaseDecreaseInAccountsReceivable
Cost and estimated earnings in excess of billings on uncompleted contracts (589,429)us-gaap_IncreaseDecreaseInUnbilledReceivables
Prepaid expenses and other 2,326,499us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Prepaid federal and state income tax 1,145,437tge_IncreaseDecreasePrepaidFederalAndStateIncomeTax
Other assets (18,035)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Trade accounts payable 2,763,004us-gaap_IncreaseDecreaseInAccountsPayableTrade
Accrued liabilities 823,278us-gaap_IncreaseDecreaseInAccruedLiabilities
Billings in excess of cost and estimated earnings on uncompleted contracts (4,550,293)us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings
Federal and state income tax payable 2,156,447us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Net cash provided by operating activities 34,174,167us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities  
Capital expenditures (22,011,503)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of property and equipment 740,658us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Net cash used in investing activities (21,270,845)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities  
Principal payments on notes payable (9,006,101)us-gaap_RepaymentsOfNotesPayable
Principal payments on capital lease obligations (1,348,164)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Proceeds from exercise of stock options 181,505us-gaap_ProceedsFromStockOptionsExercised
Purchase of treasury shares (71)us-gaap_PaymentsForRepurchaseOfCommonStock
Net cash used in financing activities (10,172,831)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase in cash and cash equivalents 2,730,491us-gaap_NetCashProvidedByUsedInContinuingOperations
Effect of exchange rates on cash (57,435)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations
Cash and cash equivalents at beginning of year 13,072,503us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year 15,745,559us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental cash flow information  
Interest paid 784,425us-gaap_InterestPaid
Income taxes paid 774,136us-gaap_IncomeTaxesPaid
Noncash investing and financing activities  
Capital lease obligations incurred 1,953,263us-gaap_CapitalLeaseObligationsIncurred
Financed equipment purchase 6,765,619us-gaap_CapitalExpendituresIncurredButNotYetPaid
Financed insurance premiums 2,336,121tge_InsurancePremiumsIncurredButNotPaid
Restricted stock awards to employees, net of cancellations 101,475tge_RestrictedStockIssued
Stock awards to employees $ 225,000us-gaap_StockIssued1