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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement
Net sales	$ 171,050us-gaap_SalesRevenueNet	$ 168,293us-gaap_SalesRevenueNet	$ 148,950us-gaap_SalesRevenueNet
Cost of goods sold	138,379us-gaap_CostOfGoodsAndServicesSold	138,480us-gaap_CostOfGoodsAndServicesSold	121,746us-gaap_CostOfGoodsAndServicesSold
Gross profit	32,671us-gaap_GrossProfit	29,813us-gaap_GrossProfit	27,204us-gaap_GrossProfit
Selling, general and administrative expenses	20,665us-gaap_SellingGeneralAndAdministrativeExpense	20,307us-gaap_SellingGeneralAndAdministrativeExpense	18,443us-gaap_SellingGeneralAndAdministrativeExpense
Operating income	12,006us-gaap_OperatingIncomeLoss	9,506us-gaap_OperatingIncomeLoss	8,761us-gaap_OperatingIncomeLoss
Interest income	521us-gaap_InvestmentIncomeInterest	524us-gaap_InvestmentIncomeInterest	960us-gaap_InvestmentIncomeInterest
Income before income taxes	12,527us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	10,030us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	9,721us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax provision	3,613us-gaap_IncomeTaxExpenseBenefit	2,502us-gaap_IncomeTaxExpenseBenefit	2,742us-gaap_IncomeTaxExpenseBenefit
Net income	$ 8,914us-gaap_NetIncomeLoss	$ 7,528us-gaap_NetIncomeLoss	$ 6,979us-gaap_NetIncomeLoss
EARNINGS PER SHARE
Basic (in dollars per share)	$ 0.24us-gaap_EarningsPerShareBasic	$ 0.20us-gaap_EarningsPerShareBasic	$ 0.19us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.24us-gaap_EarningsPerShareDiluted	$ 0.20us-gaap_EarningsPerShareDiluted	$ 0.19us-gaap_EarningsPerShareDiluted
Dividends paid per share (in dollars per share)	$ 0.16us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.15us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.63us-gaap_CommonStockDividendsPerShareCashPaid

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