Unaudited Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2016	Aug. 31, 2015
Income Statement [Abstract]
Net sales	$ 91,246	$ 100,455	$ 181,656	$ 197,224
Cost of goods sold	64,208	69,092	127,924	135,897
Gross profit margin	27,038	31,363	53,732	61,327
Selling, general and administrative	16,057	16,116	32,128	32,169
(Gain) loss from disposal of assets	(4)	(8)	2	(10)
Income from operations	10,985	15,255	21,602	29,168
Other income (expense)
Interest expense	(231)	(3)	(233)	(6)
Other, net	11	3	4	3
Total other expense	(220)		(229)	(3)
Earnings from continuing operations before income taxes	10,765	15,255	21,373	29,165
Provision for income taxes	3,981	5,644	7,906	10,791
Earnings from continuing operations	6,784	9,611	13,467	18,374
Income from discontinued operations, net of tax		1,435	2,481	1,843
Loss on sale of discontinued operations, net of tax			(26,042)
Earnings (loss) from discontinued operations, net of tax		1,435	(23,561)	1,843
Net earnings (loss)	$ 6,784	$ 11,046	$ (10,094)	$ 20,217
Weighted average common shares outstanding
Basic	25,893,218	25,662,828	25,847,051	25,636,203
Diluted	25,910,375	25,693,256	25,868,799	25,657,519
Earnings (loss) per share - basic
Continuing operations	$ 0.26	$ 0.37	$ 0.52	$ 0.72
Discontinued operations		0.06	(0.91)	0.07
Net earnings (loss)	0.26	0.43	(0.39)	0.79
Earnings (loss) per share - diluted
Continuing operations	0.26	0.37	0.52	0.72
Discontinued operations		0.06	(0.91)	0.07
Net earnings (loss)	0.26	0.43	(0.39)	0.79
Cash dividends per share	$ 1.675	$ 0.175	$ 1.850	$ 0.350