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Condensed Statements of Income and Comprehensive Income (unaudited) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenue	$ 19,876,566us-gaap_SalesRevenueNet	$ 21,883,517us-gaap_SalesRevenueNet
Cost of sales	16,274,495us-gaap_CostOfGoodsAndServicesSold	17,392,385us-gaap_CostOfGoodsAndServicesSold
Gross profit	3,602,071us-gaap_GrossProfit	4,491,132us-gaap_GrossProfit
Selling, general and administrative expenses	2,019,365us-gaap_SellingGeneralAndAdministrativeExpense	1,838,660us-gaap_SellingGeneralAndAdministrativeExpense
Income from operations	1,582,706us-gaap_OperatingIncomeLoss	2,652,472us-gaap_OperatingIncomeLoss
Interest expense	214,586us-gaap_InterestExpense	143,603us-gaap_InterestExpense
Income before provision for income taxes	1,368,120us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	2,508,869us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes	440,000us-gaap_IncomeTaxExpenseBenefit	780,000us-gaap_IncomeTaxExpenseBenefit
Net income	928,120us-gaap_NetIncomeLoss	1,728,869us-gaap_NetIncomeLoss
Other comprehensive income, net of taxes
Change in unrealized gain on interest rate swap	1,007us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	3,179us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Comprehensive income	$ 929,127us-gaap_ComprehensiveIncomeNetOfTax	$ 1,732,048us-gaap_ComprehensiveIncomeNetOfTax
Income per common share – basic (in dollars per share)	$ 0.11us-gaap_EarningsPerShareBasic	$ 0.21us-gaap_EarningsPerShareBasic
Income per common share – diluted (in dollars per share)	$ 0.11us-gaap_EarningsPerShareDiluted	$ 0.20us-gaap_EarningsPerShareDiluted
Shares used in computing income per common share:
Basic (in shares)	8,516,973us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	8,421,142us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares)	8,594,479us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	8,534,856us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

X

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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