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Quarterly Financial Information (unaudited) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information (unaudited)
Net sales	$ 35,267,000us-gaap_SalesRevenueNet	$ 35,406,000us-gaap_SalesRevenueNet	$ 34,025,000us-gaap_SalesRevenueNet	$ 34,609,000us-gaap_SalesRevenueNet	$ 34,993,000us-gaap_SalesRevenueNet	$ 34,700,000us-gaap_SalesRevenueNet	$ 35,832,000us-gaap_SalesRevenueNet	$ 33,697,000us-gaap_SalesRevenueNet	$ 139,307,000us-gaap_SalesRevenueNet	$ 139,223,000us-gaap_SalesRevenueNet	$ 130,962,000us-gaap_SalesRevenueNet
Gross profit	8,613,000us-gaap_GrossProfit	9,683,000us-gaap_GrossProfit	9,476,000us-gaap_GrossProfit	9,108,000us-gaap_GrossProfit	11,231,000us-gaap_GrossProfit	10,162,000us-gaap_GrossProfit	10,719,000us-gaap_GrossProfit	8,902,000us-gaap_GrossProfit	36,880,000us-gaap_GrossProfit	41,014,000us-gaap_GrossProfit	38,319,000us-gaap_GrossProfit
Net income from consolidated operations	$ 1,571,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 2,066,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 1,860,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 2,062,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 3,377,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 2,887,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 2,982,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 2,030,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Basic net income per share (in dollars per share)	$ 0.22us-gaap_EarningsPerShareBasic	$ 0.29us-gaap_EarningsPerShareBasic	$ 0.27us-gaap_EarningsPerShareBasic	$ 0.30us-gaap_EarningsPerShareBasic	$ 0.49us-gaap_EarningsPerShareBasic	$ 0.42us-gaap_EarningsPerShareBasic	$ 0.44us-gaap_EarningsPerShareBasic	$ 0.30us-gaap_EarningsPerShareBasic	$ 1.08us-gaap_EarningsPerShareBasic	$ 1.65us-gaap_EarningsPerShareBasic	$ 1.63us-gaap_EarningsPerShareBasic
Diluted net income per share (in dollars per share)	$ 0.22us-gaap_EarningsPerShareDiluted	$ 0.29us-gaap_EarningsPerShareDiluted	$ 0.26us-gaap_EarningsPerShareDiluted	$ 0.29us-gaap_EarningsPerShareDiluted	$ 0.47us-gaap_EarningsPerShareDiluted	$ 0.41us-gaap_EarningsPerShareDiluted	$ 0.42us-gaap_EarningsPerShareDiluted	$ 0.29us-gaap_EarningsPerShareDiluted	$ 1.05us-gaap_EarningsPerShareDiluted	$ 1.59us-gaap_EarningsPerShareDiluted	$ 1.55us-gaap_EarningsPerShareDiluted

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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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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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