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Quarterly Results of Operations (Unaudited) - Quarterly Results of Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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 Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 24,700 us-gaap_SalesRevenueNet | $ 26,500 us-gaap_SalesRevenueNet | $ 26,800 us-gaap_SalesRevenueNet | $ 25,800 us-gaap_SalesRevenueNet | $ 22,300 us-gaap_SalesRevenueNet | $ 24,200 us-gaap_SalesRevenueNet | $ 24,000 us-gaap_SalesRevenueNet | $ 21,500 us-gaap_SalesRevenueNet | $ 103,846 us-gaap_SalesRevenueNet | $ 92,045 us-gaap_SalesRevenueNet | $ 83,196 us-gaap_SalesRevenueNet
Gross profit | 7,800 us-gaap_GrossProfit | 8,100 us-gaap_GrossProfit | 8,600 us-gaap_GrossProfit | 7,700 us-gaap_GrossProfit | 6,500 us-gaap_GrossProfit | 7,500 us-gaap_GrossProfit | 7,600 us-gaap_GrossProfit | 6,000 us-gaap_GrossProfit | 32,248 us-gaap_GrossProfit | 27,574 us-gaap_GrossProfit | 24,327 us-gaap_GrossProfit
Operating income | 3,000 us-gaap_OperatingIncomeLoss | 3,400 us-gaap_OperatingIncomeLoss | 3,900 us-gaap_OperatingIncomeLoss | 3,300 us-gaap_OperatingIncomeLoss | 2,000 us-gaap_OperatingIncomeLoss | 3,000 us-gaap_OperatingIncomeLoss | 2,900 us-gaap_OperatingIncomeLoss | 1,400 us-gaap_OperatingIncomeLoss | 13,607 us-gaap_OperatingIncomeLoss | 9,328 us-gaap_OperatingIncomeLoss | 5,418 us-gaap_OperatingIncomeLoss
Net income | $ 1,700 us-gaap_NetIncomeLoss | $ 2,200 us-gaap_NetIncomeLoss | $ 2,600 us-gaap_NetIncomeLoss | $ 2,100 us-gaap_NetIncomeLoss | $ 1,300 us-gaap_NetIncomeLoss | $ 2,000 us-gaap_NetIncomeLoss | $ 1,800 us-gaap_NetIncomeLoss | $ 900 us-gaap_NetIncomeLoss | $ 8,661 us-gaap_NetIncomeLoss | $ 6,015 us-gaap_NetIncomeLoss | $ 34,961 us-gaap_NetIncomeLoss
Basic and diluted earnings per share | $ 0.14 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.18 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.21 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.17 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.11 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.16 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.15 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.07 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.70 us-gaap_EarningsPerShareBasicAndDiluted | $ 0.49 us-gaap_EarningsPerShareBasicAndDiluted | $ 2.82 us-gaap_EarningsPerShareBasicAndDiluted

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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or 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. + References No definition available. + Details
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