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SHAREHOLDERS' EQUITY (Details) (USD $)	0 Months Ended		3 Months Ended									9 Months Ended		12 Months Ended
	May 14, 2013	May 14, 2012	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Numerator:
Net loss			$ (4,009,477)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (4,712,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (3,951,687)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (4,004,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 6,351,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 4,150,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 1,112,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (1,974,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 12,384,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (3,761,777)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (1,604,244)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (6,316,041)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 15,671,879us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 10,833,215us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator:
Basic - weighted average common shares outstanding			21,957,167us-gaap_WeightedAverageNumberOfSharesOutstandingBasic		21,832,831us-gaap_WeightedAverageNumberOfSharesOutstandingBasic							21,956,804us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	21,805,692us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	21,841,582us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	21,513,638us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	21,215,800us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of Dilutive Securities:
Stock options															384,738us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	332,601us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Diluted - weighted average common shares outstanding			21,957,167us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding		21,832,831us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding							21,956,804us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	21,805,692us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	21,841,582us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	21,898,376us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	21,548,401us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic EPS (in dollars per share)			$ (0.18)us-gaap_EarningsPerShareBasic	$ (0.21)us-gaap_EarningsPerShareBasic	$ (0.18)us-gaap_EarningsPerShareBasic	$ (0.18)us-gaap_EarningsPerShareBasic	$ 0.29us-gaap_EarningsPerShareBasic	$ 0.19us-gaap_EarningsPerShareBasic	$ 0.05us-gaap_EarningsPerShareBasic	$ (0.09)us-gaap_EarningsPerShareBasic	$ 0.58us-gaap_EarningsPerShareBasic	$ (0.17)us-gaap_EarningsPerShareBasic	$ (0.07)us-gaap_EarningsPerShareBasic	$ (0.29)us-gaap_EarningsPerShareBasic	$ 0.73us-gaap_EarningsPerShareBasic	$ 0.51us-gaap_EarningsPerShareBasic
Diluted EPS (in dollars per share)			$ (0.18)us-gaap_EarningsPerShareDiluted	$ (0.21)us-gaap_EarningsPerShareDiluted	$ (0.18)us-gaap_EarningsPerShareDiluted	$ (0.18)us-gaap_EarningsPerShareDiluted	$ 0.29us-gaap_EarningsPerShareDiluted	$ 0.19us-gaap_EarningsPerShareDiluted	$ 0.05us-gaap_EarningsPerShareDiluted	$ (0.09)us-gaap_EarningsPerShareDiluted	$ 0.57us-gaap_EarningsPerShareDiluted	$ (0.17)us-gaap_EarningsPerShareDiluted	$ (0.07)us-gaap_EarningsPerShareDiluted	$ (0.29)us-gaap_EarningsPerShareDiluted	$ 0.72us-gaap_EarningsPerShareDiluted	$ 0.50us-gaap_EarningsPerShareDiluted
Other disclosures
Outstanding options that were not included in the diluted calculation because their effect would be anti-dilutive (in shares)														35,373us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	44,370us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Percentage of dividend paid on common stock	5.00%tge_CommonStockDividendsPaidPercentage	5.00%tge_CommonStockDividendsPaidPercentage										0.00%tge_CommonStockDividendsPaidPercentage		5.00%tge_CommonStockDividendsPaidPercentage	5.00%tge_CommonStockDividendsPaidPercentage

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