Summary of Quarterly Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Feb. 28, 2013		Nov. 30, 2012		Aug. 31, 2012		May 31, 2012		Feb. 29, 2012		Nov. 30, 2011		Aug. 31, 2011		May 31, 2011		Feb. 28, 2013		Feb. 29, 2012		Feb. 28, 2011
Quarterly Financial Data [Line Items]
Net Sales	$ 25,859		$ 30,387		$ 29,927		$ 34,834		$ 32,272		$ 34,009		$ 34,417		$ 36,036		$ 121,007		$ 136,734		$ 137,624
Gross Profit	6,168		7,238		6,553		8,555		7,188		9,307		7,651		9,522		28,514		33,668		31,682
Income From Operations	1,536	[1]	2,289	[1]	4,784	[1]	3,097	[1]	1,723	[2]	3,693	[2]	2,580	[2]	3,972	[2]	11,706	[1]	11,968	[2]	10,660
Total Other Income, Net	80		107		387		329		239		461		436		447		903		1,583		1,708
Net Income	$ 1,352		$ 2,171		$ 3,253		$ 2,218		$ 17,563		$ 3,726		$ 3,021		$ 4,157		$ 8,994		$ 28,467		$ 12,044
Basic Net Income Per Share	$ 0.13	[3]	$ 0.21	[3]	$ 0.31	[3]	$ 0.21	[3]	$ 1.65	[3]	$ 0.35	[3]	$ 0.26	[3]	$ 0.33	[3]	$ 0.87	[3]	$ 2.51	[3]	$ 0.93
Diluted Net Income Per Share	$ 0.13	[3]	$ 0.21	[3]	$ 0.31	[3]	$ 0.21	[3]	$ 1.67	[3]	$ 0.34	[3]	$ 0.26	[3]	$ 0.33	[3]	$ 0.86	[3]	$ 2.49	[3]	$ 0.93

[1] Income from operations in the second quarter of fiscal 2013 included a gain on sale of $3.2 million as discussed in Note 18, "Sale of Elk Grove Village Building."

[2] Income from operations in the second and fourth quarters of fiscal 2012 included charges of $0.3 million and $0.3 million related to employee termination benefit expenses as discussed in Note 14, "Restructuring."

[3] The sum of the four quarters is not necessarily the same as the total for the year.