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Quarterly Results of Operations (Unaudited) - Quarterly Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 25,700	$ 26,500	$ 28,900	$ 27,900	$ 24,700	$ 26,500	$ 26,800	$ 25,800	$ 108,994	$ 103,846	$ 92,045
Gross profit	7,500	8,100	9,200	8,600	7,800	8,100	8,600	7,700	33,401	32,248	27,574
Operating income	2,600	3,400	4,300	3,700	3,000	3,400	3,900	3,300	13,971	13,607	9,328
Net income	$ 1,700	$ 2,200	$ 2,800	$ 2,400	$ 1,700	$ 2,200	$ 2,600	$ 2,100	$ 9,118	$ 8,661	$ 6,015
Basic and diluted earnings per share	$ 0.13	$ 0.18	$ 0.23	$ 0.19	$ 0.14	$ 0.18	$ 0.21	$ 0.17	$ 0.73	$ 0.70	$ 0.49

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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.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1,2)
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=51831255

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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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