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Statements of Income and Comprehensive Income (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenue $ 39,687,010us-gaap_SalesRevenueNet $ 82,988,522us-gaap_SalesRevenueNet $ 89,272,582us-gaap_SalesRevenueNet
Cost of sales 69,411,709us-gaap_CostOfGoodsAndServicesSold 64,555,275us-gaap_CostOfGoodsAndServicesSold 65,039,969us-gaap_CostOfGoodsAndServicesSold
Gross profit (loss) (29,724,699)us-gaap_GrossProfit 18,433,247us-gaap_GrossProfit 24,232,613us-gaap_GrossProfit
Selling, general and administrative expenses 7,308,220us-gaap_SellingGeneralAndAdministrativeExpense 6,704,524us-gaap_SellingGeneralAndAdministrativeExpense 7,322,630us-gaap_SellingGeneralAndAdministrativeExpense
Income (loss) from operations (37,032,919)us-gaap_OperatingIncomeLoss 11,728,723us-gaap_OperatingIncomeLoss 16,909,983us-gaap_OperatingIncomeLoss
Other income (expense):      
Interest/other income 145,072us-gaap_InterestAndOtherIncome 78,957us-gaap_InterestAndOtherIncome 31,520us-gaap_InterestAndOtherIncome
Interest expense (794,428)us-gaap_InterestExpense (653,786)us-gaap_InterestExpense (416,373)us-gaap_InterestExpense
Total other expense, net (649,356)us-gaap_OtherIncome (574,829)us-gaap_OtherIncome (384,853)us-gaap_OtherIncome
Income (loss) before provision for (benefit from) income taxes (37,682,275)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 11,153,894us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 16,525,130us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for (benefit from) income taxes (12,473,000)us-gaap_IncomeTaxExpenseBenefit 3,417,000us-gaap_IncomeTaxExpenseBenefit 5,514,000us-gaap_IncomeTaxExpenseBenefit
Net income (loss) (25,209,275)us-gaap_NetIncomeLoss 7,736,894us-gaap_NetIncomeLoss 11,011,130us-gaap_NetIncomeLoss
Other comprehensive income (loss), net of tax      
Change in unrealized gain (loss)-interest rate swap 11,399us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 19,712us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax (19,055)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Comprehensive income (loss) $ (25,197,876)us-gaap_ComprehensiveIncomeNetOfTax $ 7,756,606us-gaap_ComprehensiveIncomeNetOfTax $ 10,992,075us-gaap_ComprehensiveIncomeNetOfTax
Income (loss) per common share-basic (in Dollars per share) $ (2.98)us-gaap_EarningsPerShareBasic $ 0.92us-gaap_EarningsPerShareBasic $ 1.43us-gaap_EarningsPerShareBasic
Income (loss) per common share-diluted (in Dollars per share) $ (2.98)us-gaap_EarningsPerShareDiluted $ 0.91us-gaap_EarningsPerShareDiluted $ 1.40us-gaap_EarningsPerShareDiluted
Shares used in computing income (loss) per common share:      
Basic (in Shares) 8,465,937us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 8,389,048us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 7,721,304us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in Shares) 8,465,937us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 8,470,578us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 7,865,090us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding