Unaudited Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2017	Aug. 31, 2016
Income Statement [Abstract]
Net sales	$ 94,887	$ 91,246	$ 189,477	$ 181,656
Cost of goods sold	64,100	64,208	128,771	127,924
Gross profit margin	30,787	27,038	60,706	53,732
Selling, general and administrative	17,096	16,057	34,468	32,128
(Gain) loss from disposal of assets	48	(4)	63	2
Income from operations	13,643	10,985	26,175	21,602
Other income (expense)
Interest expense	(204)	(231)	(394)	(233)
Other, net	117	11	130	4
Total other expense	(87)	(220)	(264)	(229)
Earnings from continuing operations before income taxes	13,556	10,765	25,911	21,373
Provision for income taxes	5,016	3,981	9,587	7,906
Earnings from continuing operations	8,540	6,784	16,324	13,467
Income from discontinued operations, net of tax				2,481
Loss on sale of discontinued operations, net of tax				(26,042)
Loss from discontinued operations, net of tax				(23,561)
Net earnings (loss)	$ 8,540	$ 6,784	$ 16,324	$ (10,094)
Weighted average common shares outstanding
Basic	25,342,747	25,893,218	25,388,292	25,847,051
Diluted	25,366,001	25,910,375	25,405,863	25,868,799
Earnings (loss) per share - basic and diluted
Continuing operations	$ 0.34	$ 0.26	$ 0.64	$ 0.52
Discontinued operations				(0.91)
Net earnings (loss)	0.34	0.26	0.64	(0.39)
Cash dividends per share	$ 0.20	$ 1.675	$ 0.375	$ 1.85