Unaudited Quarterly Financial Data - Schedule of Quarterly Financial Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended															12 Months Ended
	Mar. 31, 2015		Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013	Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 30,953		$ 23,239		$ 17,671		$ 17,919		$ 28,273	[1]	$ 22,628	$ 15,464		$ 19,568		$ 89,782	$ 85,933	$ 79,956
Gross profit	12,469		9,844		6,985		5,566		10,474	[1]	8,439	5,413		6,805		34,864	31,131	32,813
Operating income (loss)	6,873		5,195	[2]	1,057	[2],[3]	(220)	[2],[4]	4,416		2,725	(305)	[2]	2,253	[4]	12,905	9,089	8,190
Net income	$ 5,385	[5],[6]	$ 9,044	[5],[7]	$ 640		$ (162)		$ 2,815		$ 1,670	$ (217)		$ 1,373		$ 14,907	$ 5,641	$ 4,076
Basic earnings (loss) per share:	$ 0.55		$ 0.92		$ 0.07		$ (0.02)		$ 0.29		$ 0.17	$ (0.02)		$ 0.14		$ 1.52	$ 0.58	$ 0.43
Diluted earnings (loss) per share:	$ 0.54		$ 0.91		$ 0.06		$ (0.02)		$ 0.29		$ 0.17	$ (0.02)		$ 0.14		$ 1.50	$ 0.58	$ 0.43

[1] The Company terminated a distributor contract which resulted in sales returns of $1,538 and lowered gross profit by $1,033.

[2] Included in operating income in Fiscal 2015 are Executive transition costs of $534, $59 and $85, in the first, second and third quarters, respectively. Executive transition costs of $240 are included in operating income in fiscal 2014.

[3] Included in operating income is $288 of internal re-organization costs.

[4] Included in operating income is an environmental benefit of $412 and $1,207 in fiscal 2015 and fiscal 2014, respectively, from the reversal of an environmental reserve. See Note 13.

[5] Included in net income is a research & development tax credit of $5,020 and $1,273, in the third and fourth quarters, respectively. See Note 5.

[6] Included in net income is a gain of $503 from the sale of a property located in Irvington, New Jersey, which had a zero book value, was previously operated by one of our predecessor affiliates, and not used in our operations.

[7] Included in net income is $1,224 from a refund received from a real estate property tax review and assessment reduction for the Glen Head, New York property.