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DEBT (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
item
Sep. 30, 2014
Debt Instruments      
Notes Payable $ 14,917,991us-gaap_NotesPayable 25,027,877us-gaap_NotesPayable  
Less current maturities (8,434,879)us-gaap_NotesPayableCurrent (10,615,279)us-gaap_NotesPayableCurrent (9,214,619)us-gaap_NotesPayableCurrent
Notes payable, Noncurrent 6,483,112us-gaap_LongTermNotesPayable 14,412,598us-gaap_LongTermNotesPayable 6,312,379us-gaap_LongTermNotesPayable
Annual maturities of notes payable      
2014 8,434,879us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths    
2015 4,814,389us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo    
2016 1,540,360us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree    
2017 128,363us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour    
Total 14,917,991us-gaap_NotesPayable 25,027,877us-gaap_NotesPayable  
Revolving credit facility      
Debt Instruments      
Maximum borrowing capacity 5,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
   
Line of credit facility, base rate prime rate    
Debt instrument stated rate (as a percent) 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
   
Borrowings outstanding 0us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
   
Notes payable to commercial banks      
Debt Instruments      
Notes Payable 14,416,225us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
24,553,291us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
 
Annual maturities of notes payable      
Total 14,416,225us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
24,553,291us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember
 
Notes payable with interest rate between 3.50% and 4.60%      
Debt Instruments      
Number of notes payable 4tge_NumberOfNotesPayable
/ us-gaap_LongtermDebtTypeAxis
= tge_NotesPayableWithInterestRateBetween3.50PercentAnd4.60PercentMember
4tge_NumberOfNotesPayable
/ us-gaap_LongtermDebtTypeAxis
= tge_NotesPayableWithInterestRateBetween3.50PercentAnd4.60PercentMember
 
Minimum interest rate (as a percent) 3.50%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= tge_NotesPayableWithInterestRateBetween3.50PercentAnd4.60PercentMember
3.50%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= tge_NotesPayableWithInterestRateBetween3.50PercentAnd4.60PercentMember
 
Maximum interest rate (as a percent) 4.60%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= tge_NotesPayableWithInterestRateBetween3.50PercentAnd4.60PercentMember
4.60%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= tge_NotesPayableWithInterestRateBetween3.50PercentAnd4.60PercentMember
 
Notes payable with interest rate between 3.50% and 4.60% | Minimum      
Debt Instruments      
Monthly principal installments 128,363us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_LongtermDebtTypeAxis
= tge_NotesPayableWithInterestRateBetween3.50PercentAnd4.60PercentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
128,363us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_LongtermDebtTypeAxis
= tge_NotesPayableWithInterestRateBetween3.50PercentAnd4.60PercentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Notes payable with interest rate between 3.50% and 4.60% | Maximum      
Debt Instruments      
Monthly principal installments 215,863us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_LongtermDebtTypeAxis
= tge_NotesPayableWithInterestRateBetween3.50PercentAnd4.60PercentMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
215,863us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_LongtermDebtTypeAxis
= tge_NotesPayableWithInterestRateBetween3.50PercentAnd4.60PercentMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Notes Payable to finance companies for insurance notes      
Debt Instruments      
Notes Payable 501,766us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= tge_NotesPayableToFinanceCompaniesForInsuranceNotesMember
474,586us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= tge_NotesPayableToFinanceCompaniesForInsuranceNotesMember
 
Annual maturities of notes payable      
Total 501,766us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= tge_NotesPayableToFinanceCompaniesForInsuranceNotesMember
474,586us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= tge_NotesPayableToFinanceCompaniesForInsuranceNotesMember
 
Notes payable with interest rate between 4.00% and 4.95%      
Debt Instruments      
Number of notes payable 2tge_NumberOfNotesPayable
/ us-gaap_LongtermDebtTypeAxis
= tge_NotesPayableWithInterestRateBetween4.00PercentAnd4.95PercentMember
2tge_NumberOfNotesPayable
/ us-gaap_LongtermDebtTypeAxis
= tge_NotesPayableWithInterestRateBetween4.00PercentAnd4.95PercentMember
 
Minimum interest rate (as a percent) 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= tge_NotesPayableWithInterestRateBetween4.00PercentAnd4.95PercentMember
4.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= tge_NotesPayableWithInterestRateBetween4.00PercentAnd4.95PercentMember
 
Maximum interest rate (as a percent) 4.95%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= tge_NotesPayableWithInterestRateBetween4.00PercentAnd4.95PercentMember
4.95%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= tge_NotesPayableWithInterestRateBetween4.00PercentAnd4.95PercentMember
 
Notes payable with interest rate between 4.00% and 4.95% | Minimum      
Debt Instruments      
Monthly principal installments 18,831us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_LongtermDebtTypeAxis
= tge_NotesPayableWithInterestRateBetween4.00PercentAnd4.95PercentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
18,831us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_LongtermDebtTypeAxis
= tge_NotesPayableWithInterestRateBetween4.00PercentAnd4.95PercentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Notes payable with interest rate between 4.00% and 4.95% | Maximum      
Debt Instruments      
Monthly principal installments $ 329,823us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_LongtermDebtTypeAxis
= tge_NotesPayableWithInterestRateBetween4.00PercentAnd4.95PercentMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
329,823us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_LongtermDebtTypeAxis
= tge_NotesPayableWithInterestRateBetween4.00PercentAnd4.95PercentMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember