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MERGER (Details)
3 Months Ended 6 Months Ended
Feb. 11, 2015
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
Common stock, par value (in dollars per share) | $ / shares   $ 0.01 $ 0.01  
Fair value of assets acquired and liabilities assumed        
Common stock, shares outstanding | shares   21,580,865 21,622,349  
Legacy TGC        
Common stock, par value (in dollars per share) | $ / shares $ 0.01      
Reverse stock split ratio 0.33      
Split-effected Common Stock | shares 1.760      
Increase in preliminary estimated amount of property and equipment   $ 5,055,000    
Increase in preliminary estimated amount of current liability   943,000    
Decrease in preliminary estimated amount of current assets   625,000    
Decrease in preliminary estimated amount of intangible assets   2,953,000    
Decrease in deferred tax assets related to adjustments to preliminary estimates   534,000    
Increase in depreciation   628,000    
Decrease in amortization expense   $ 697,000    
Fair value of assets acquired and liabilities assumed        
Stock consideration $ 42,902,000      
Interest bearing debt assumed 12,048,000      
Debt-free current liabilities 13,590,000      
Total purchase price consideration including liabilities assumed 68,540,000      
Current assets excluding cash and cash equivalents 15,531,000      
Cash and cash equivalents 12,382,000      
Total current assets 27,913,000      
Fair value of property and equipment 33,867,000      
Net deferred tax asset 6,360,000      
Total indicated value of assets $ 68,540,000      
Common stock, shares outstanding | shares 7,381,476      
Accrued taxes $ 865,000      
Pre-tax merger-related costs     $ 0 $ 2,600,000
Legacy TGC | Minimum        
Fair value of assets acquired and liabilities assumed        
Estimated useful lives of property and equipment 18 months      
Legacy TGC | Maximum        
Fair value of assets acquired and liabilities assumed        
Estimated useful lives of property and equipment 12 years      
Legacy TGC | Trademarks/tradenames        
Fair value of assets acquired and liabilities assumed        
Identified intangible assets $ 400,000      
Legacy Dawson        
Common stock, par value (in dollars per share) | $ / shares $ 0.3330