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Segment Reporting - Quarterly Information for the Applicable Time Periods (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012
Quarterly information for the applicable time periods
Net sales	$ 18,146	$ 17,585	$ 15,169	$ 14,430	$ 15,035	$ 11,725	$ 12,872	$ 14,432	$ 65,330		$ 54,065
Gross profit	3,572	2,867	2,396	2,980	2,490	1,689	2,172	1,772	11,815		8,123
Net income (loss)	$ 592	$ 901	$ 1,063	$ 1,653	$ 487	$ 500	$ 761	$ 334	$ 4,209	[1]	$ 2,084
Earnings (loss) per common share:
Basic	$ 0.07	$ 0.11	$ 0.13	$ 0.21	$ 0.06	$ 0.06	$ 0.10	$ 0.04	$ 0.53		$ 0.26
[1] Net of preferred dividends of $225 and $342 in 2012 and 2013 respectively.

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