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MERGER (Details) (USD $)	3 Months Ended		0 Months Ended		2 Months Ended
MERGER (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Feb. 11, 2015	Feb. 10, 2015	Mar. 31, 2015	Dec. 31, 2014
Common stock, par value (in dollars per share)	$ 0.01				$ 0.01	$ 0.01
Common stock, shares outstanding	21,591,126us-gaap_CommonStockSharesOutstanding				21,591,126us-gaap_CommonStockSharesOutstanding	14,216,540us-gaap_CommonStockSharesOutstanding
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Finite-Lived Intangible Assets, Net	$ 2,797,000us-gaap_FiniteLivedIntangibleAssetsNet				$ 2,797,000us-gaap_FiniteLivedIntangibleAssetsNet
Business Acquisition, Pro Forma Information [Abstract]
Shares used in calculation of earnings per share	21,647,889	21,328,048
Pro forma total revenues	87,332,000	125,567,000
Pro forma net (loss) income	(10,569,000)	8,958,000
Pro forma net income per share:
Basic	$ (0.49)	$ 0.42
Diluted	$ (0.49)	$ 0.42
Minimum
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Finite-Lived Intangible Asset, Useful Life	5 months
Maximum
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Finite-Lived Intangible Asset, Useful Life	5 years
Legacy TGC
Common stock, par value (in dollars per share)			$ 0.33	$ 0.01
Reverse stock split ratio				0.33
Split-effected Common Stock			1.760
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Closing price per share			$ 5.85
Stock Consideration			42,902,000
Interest Bearing Debt Assumed			12,048,000
Total Purchase Price Consideration			54,950,000
Debt-free Current Liabilities			12,647,000
Total Equity and Liabilities			67,597,000
Current Assets excluding Cash and Equivalents			16,156,000
Cash and Equivalents			12,382,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Total			28,538,000
Fair Value of Property, Plant and Equipment			28,812,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Assets, Total			28,812,000
Identified Intangible Assets			3,353,000
Deferred Tax Asset			6,894,000
Total Indicated Value of Assets			67,597,000
Accrued Income Taxes			750,000
Pre-tax merger related costs			2,600,000
Severance and compensation arrangements			530,000
Business Acquisition, Pro Forma Information [Abstract]
Pro forma total revenues					8,592,000
Pro forma net (loss) income					2,837,000
Legacy TGC \| Minimum
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Property, Plant and Equipment, Useful Life			2 years
Legacy TGC \| Maximum
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Property, Plant and Equipment, Useful Life			15 years
Legacy TGC \| Trademarks/Trade Names
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Identified Intangible Assets			1,063,000
Legacy TGC \| Customer Relationships
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Identified Intangible Assets			1,799,000
Finite-Lived Intangible Asset, Useful Life			5 years
Finite-Lived Intangible Assets, Net	1,799,000				1,799,000
Finite-Lived Intangible Assets, Accumulated Amortization	147,000				147,000
Legacy TGC \| Backlog
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Identified Intangible Assets			491,000
Finite-Lived Intangible Assets, Net	491,000				491,000
Finite-Lived Intangible Assets, Accumulated Amortization	$ 76,000				$ 76,000
Legacy TGC \| Backlog \| Weighted Average [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]
Finite-Lived Intangible Asset, Useful Life			5 months