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Consolidated Statements of Operations (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revenue $ 9,692,444us-gaap_Revenues $ 4,385,071us-gaap_Revenues
Cost of revenue 5,932,616us-gaap_CostOfRevenue 2,405,669us-gaap_CostOfRevenue
Gross profit 3,759,828us-gaap_GrossProfit 1,979,402us-gaap_GrossProfit
Operating expenses    
Research and development 211,890us-gaap_ResearchAndDevelopmentExpense 195,930us-gaap_ResearchAndDevelopmentExpense
Selling and shipping 313,817us-gaap_SellingExpense 358,325us-gaap_SellingExpense
General and administrative 2,027,110us-gaap_GeneralAndAdministrativeExpense 1,475,062us-gaap_GeneralAndAdministrativeExpense
Total operating expenses 2,552,817us-gaap_OperatingExpenses 2,029,317us-gaap_OperatingExpenses
Operating income/( loss) 1,207,011us-gaap_OperatingIncomeLoss (49,915)us-gaap_OperatingIncomeLoss
Other income (expense)    
Interest income 6,082us-gaap_InvestmentIncomeInterest 6,334us-gaap_InvestmentIncomeInterest
Interest expense (24,725)us-gaap_InterestExpense (29,015)us-gaap_InterestExpense
Other income 781us-gaap_OtherNonoperatingIncomeExpense 23,829us-gaap_OtherNonoperatingIncomeExpense
Total other (expense)/ income (17,862)us-gaap_NonoperatingIncomeExpense 1,148us-gaap_NonoperatingIncomeExpense
Income/(loss) before income tax (expense)/benefit 1,189,149us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (48,767)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense 520,927us-gaap_IncomeTaxExpenseBenefit 219,380us-gaap_IncomeTaxExpenseBenefit
Net income/(loss) $ 668,222us-gaap_NetIncomeLoss $ (268,147)us-gaap_NetIncomeLoss
Basic income/(loss) per common share (in dollars per share) $ 0.11us-gaap_EarningsPerShareBasic $ (0.04)us-gaap_EarningsPerShareBasic
Diluted income/(loss) per common share (in dollars per share) $ 0.11us-gaap_EarningsPerShareDiluted $ (0.04)us-gaap_EarningsPerShareDiluted
Weighted average common shares outstanding basic (in shares) 6,168,307us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 6,104,782us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Net effect of potential common share issuance (in shares) 130,887us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment  
Weighted average common shares outstanding diluted (in shares) 6,299,194us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 6,104,782us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding