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SHAREHOLDERS' EQUITY (Details 2) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Apr. 30, 2013
Jun. 11, 2010
Jun. 25, 2013
Feb. 01, 2013
Aug. 31, 2012
Jan. 31, 2012
Dec. 31, 2011
Nov. 30, 2011
Share-Based Compensation Plans                              
Options granted         117,611us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 143,602us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 109,347us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross                
Compensation expense $ 164,000us-gaap_AllocatedShareBasedCompensationExpense $ 158,000us-gaap_AllocatedShareBasedCompensationExpense $ 544,000us-gaap_AllocatedShareBasedCompensationExpense $ 817,000us-gaap_AllocatedShareBasedCompensationExpense                      
Unrecognized deferred stock-based compensation expenses 488,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized   488,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized   0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized 0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized 0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized             0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized  
Stock option                              
Share-Based Compensation Plans                              
Options granted         0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
                 
Compensation expense         206,952us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
283,950us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
230,167us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
               
Restricted stock                              
Share-Based Compensation Plans                              
Shares rescinded               45,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
             
Compensation expense         492,692us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
317,109us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
28,603us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
               
2006 Plan                              
Share-Based Compensation Plans                              
Number of additional shares authorized                 2,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_PlanNameAxis
= tge_StockAwardPlan2006Member
           
Aggregate number of shares of common stock under the 2006 Plan         3,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= tge_StockAwardPlan2006Member
                   
Number of directors in the committee for the 2006 Plan         3tge_NumberOfDirectorsInCommittee
/ us-gaap_PlanNameAxis
= tge_StockAwardPlan2006Member
                   
Option expiration term         5 years                    
2006 Plan | Stock option                              
Share-Based Compensation Plans                              
Options granted         117,611us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= tge_StockAwardPlan2006Member
143,602us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= tge_StockAwardPlan2006Member
109,347us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= tge_StockAwardPlan2006Member
               
Options exercised or cancelled during the period (in shares)         391,733tge_StockIssuedDuringPeriodSharesStockOptionsExercisedOrCancelled
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= tge_StockAwardPlan2006Member
244,445tge_StockIssuedDuringPeriodSharesStockOptionsExercisedOrCancelled
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= tge_StockAwardPlan2006Member
80,334tge_StockIssuedDuringPeriodSharesStockOptionsExercisedOrCancelled
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= tge_StockAwardPlan2006Member
               
2006 Plan | Restricted stock                              
Share-Based Compensation Plans                              
Shares granted                   30,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= tge_StockAwardPlan2006Member
6,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= tge_StockAwardPlan2006Member
213,125us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= tge_StockAwardPlan2006Member
6,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= tge_StockAwardPlan2006Member
21,520us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= tge_StockAwardPlan2006Member
25,331us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= tge_StockAwardPlan2006Member
Compensation expense         $ 492,692us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= tge_StockAwardPlan2006Member
$ 317,109us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= tge_StockAwardPlan2006Member
$ 28,603us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= tge_StockAwardPlan2006Member