Unaudited Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2021	Aug. 31, 2020
Income Statement [Abstract]
Net sales	$ 100,451	$ 86,612	$ 197,381	$ 175,608
Type of revenue [extensible list]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Cost of goods sold	$ 71,550	$ 61,457	$ 139,294	$ 126,546
Type of cost, good or service [extensible list]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Gross profit margin	$ 28,901	$ 25,155	$ 58,087	$ 49,062
Selling, general and administrative	18,095	16,535	37,010	34,658
(Gain) loss from disposal of assets	1	(300)	(276)	(412)
Income from operations	10,805	8,920	21,353	14,816
Other expense
Interest expense	(2)	(3)	(4)	(6)
Other, net	(146)	(240)	(258)	(478)
Total other expense	(148)	(243)	(262)	(484)
Earnings before income taxes	10,657	8,677	21,091	14,332
Income tax expense	3,197	2,256	6,327	3,726
Net earnings	$ 7,460	$ 6,421	$ 14,764	$ 10,606
Weighted average common shares outstanding
Basic	26,080,121	25,974,412	26,055,056	25,965,370
Diluted	26,170,396	25,974,412	26,146,421	25,965,370
Earnings per share
Basic	$ 0.29	$ 0.25	$ 0.57	$ 0.41
Diluted	0.29	0.25	0.57	0.41
Cash dividends per share	$ 0.250	$ 0.225	$ 0.475	$ 0.450