Segments (Details) (USD $)	3 Months Ended				9 Months Ended
	Nov. 30, 2012		Nov. 30, 2011		Nov. 30, 2012		Nov. 30, 2011
Operations and assets by segment
Net Sales	$ 149,674,616		$ 116,492,703		$ 430,202,771		$ 345,486,904
Operating Income	33,401,000	[1]	24,274,000	[1]	95,718,000	[1]	72,645,000	[1]
General Corporate Expense	5,721,000	[2]	4,662,000	[2]	17,795,000	[2]	15,778,000	[2]
Interest Expense	3,234,340		3,518,978		9,802,412		10,453,156
Other (Income) Expense, Net	275,000	[3]	(75,000)	[3]	(5,733,000)	[3]	(340,000)	[3]
Total expenses	9,230,000		8,106,000		21,864,000		25,891,000
Income Before Income Taxes	24,171,000		16,168,000		73,854,000		46,754,000
Total Assets	674,465,000		593,666,000		674,465,000		593,666,000
Electrical and Industrial Products [Member]
Operations and assets by segment
Net Sales	60,421,000		43,849,000		171,633,000		136,518,000
Operating Income	8,952,000	[1]	5,719,000	[1]	25,087,000	[1]	18,214,000	[1]
Total Assets	260,191,000		136,008,000		260,191,000		136,008,000
Galvanizing Services [Member]
Operations and assets by segment
Net Sales	89,254,000		72,644,000		258,570,000		208,969,000
Operating Income	24,449,000	[1]	18,555,000	[1]	70,631,000	[1]	54,431,000	[1]
Total Assets	359,694,000		283,141,000		359,694,000		283,141,000
Corporate [Member]
Operations and assets by segment
Total Assets	$ 54,580,000		$ 174,517,000		$ 54,580,000		$ 174,517,000

[1] Segment operating income consists of net sales, less cost of sales, specifically identifiable selling, general and administrative expenses, and other income and expense items that are specifically identifiable to a segment.

[2] General Corporate Expense consists of selling, general and administrative expenses that are not specifically identifiable to a segment.

[3] Other (income) expense, net includes other (income) expenses not specifically identifiable to a segment.