CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $)	3 Months Ended
Apr. 04, 2015	Mar. 29, 2014
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) [Abstract]
Net sales	$ 36,876,842us-gaap_SalesRevenueGoodsNet	$ 35,849,126us-gaap_SalesRevenueGoodsNet
Cost of products sold	(29,541,664)us-gaap_CostOfGoodsSold	(28,335,720)us-gaap_CostOfGoodsSold
Gross margin	7,335,178us-gaap_GrossProfit	7,513,406us-gaap_GrossProfit
Selling and administrative expenses	(5,963,695)	(5,216,289)
Operating profit	1,371,483us-gaap_OperatingIncomeLoss	2,297,117us-gaap_OperatingIncomeLoss
Interest expense	(52,825)us-gaap_InterestExpense	(68,569)us-gaap_InterestExpense
Other income	7,007us-gaap_NonoperatingIncomeExpense	7,283us-gaap_NonoperatingIncomeExpense
Income before income taxes	1,325,665	2,235,831
Income taxes	451,714us-gaap_IncomeTaxExpenseBenefit	732,946us-gaap_IncomeTaxExpenseBenefit
Net income	$ 873,951us-gaap_NetIncomeLoss	$ 1,502,885us-gaap_NetIncomeLoss
Earnings per share:
Basic (in dollars per share)	$ 0.14us-gaap_EarningsPerShareBasic	$ 0.24us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.14us-gaap_EarningsPerShareDiluted	$ 0.24us-gaap_EarningsPerShareDiluted
Cash dividends per share: (in dollars per share)	$ 0.11	$ 0.11

Aggregate dividends paid during the period for each share of common stock outstanding.

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Total costs related to goods produced and sold during the reporting period.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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