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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
CONSOLIDATED STATEMENTS OF OPERATIONS      
Revenue $ 118,847,754us-gaap_SalesRevenueServicesNet $ 134,534,540us-gaap_SalesRevenueServicesNet $ 196,317,215us-gaap_SalesRevenueServicesNet
Cost and expenses      
Cost of services 101,582,377us-gaap_CostOfServices 107,675,356us-gaap_CostOfServices 135,279,937us-gaap_CostOfServices
Selling, general and administrative 11,660,137us-gaap_SellingGeneralAndAdministrativeExpense 9,593,068us-gaap_SellingGeneralAndAdministrativeExpense 8,755,270us-gaap_SellingGeneralAndAdministrativeExpense
Depreciation and amortization expense 19,152,286us-gaap_DepreciationAndAmortization 24,644,190us-gaap_DepreciationAndAmortization 25,502,597us-gaap_DepreciationAndAmortization
Total cost and expenses 132,394,800us-gaap_CostsAndExpenses 141,912,614us-gaap_CostsAndExpenses 169,537,804us-gaap_CostsAndExpenses
Loss from operations (13,547,046)us-gaap_OperatingIncomeLoss (7,378,074)us-gaap_OperatingIncomeLoss 26,779,411us-gaap_OperatingIncomeLoss
Interest expense 677,718us-gaap_InterestExpense 1,091,476us-gaap_InterestExpense 1,222,454us-gaap_InterestExpense
Loss before income taxes (14,224,764)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (8,469,550)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 25,556,957us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
NET LOSS (9,528,330)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (6,316,041)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 15,671,879us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Income tax expense (benefit):      
Current Income Tax Expense (Benefit) 1,048,805us-gaap_CurrentIncomeTaxExpenseBenefit 1,155,204us-gaap_CurrentIncomeTaxExpenseBenefit 9,525,543us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred Income Tax Expense (Benefit) (5,745,239)us-gaap_DeferredIncomeTaxExpenseBenefit (3,308,713)us-gaap_DeferredIncomeTaxExpenseBenefit 359,535us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense (benefit): $ (4,696,434)us-gaap_IncomeTaxExpenseBenefit $ (2,153,509)us-gaap_IncomeTaxExpenseBenefit $ 9,885,078us-gaap_IncomeTaxExpenseBenefit
Net income (loss) per common share:      
Basic (in dollars per share) $ (1.30)us-gaap_EarningsPerShareBasic $ (0.87)us-gaap_EarningsPerShareBasic $ 2.19us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) $ (1.30)us-gaap_EarningsPerShareDiluted $ (0.87)us-gaap_EarningsPerShareDiluted $ 2.15us-gaap_EarningsPerShareDiluted
Weighted average number of shares outstanding:      
Basic (in shares) 7,322,358us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 7,280,527us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 7,171,212us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) 7,322,358us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 7,280,527us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 7,299,458us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding