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EARNINGS (LOSS) PER SHARE (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
EARNINGS (LOSS) PER SHARE
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
Numerator:
Net income			$ (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
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
Numerator:
Net income			$ (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:
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:
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
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

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