Segments (Details) (USD $)	3 Months Ended				9 Months Ended
	Nov. 30, 2013 segment		Nov. 30, 2012		Nov. 30, 2013		Nov. 30, 2012
Segment Reporting Information [Line Items]
Number of operating segments	2
Operations and assets by segment
Net Sales	$ 197,755,332		$ 149,674,616		$ 570,712,180		$ 430,202,771
Operating Income	33,169,000	[1]	33,401,000	[1]	108,893,000	[1]	95,718,000	[1]
General Corporate Expense	8,012,000	[2]	5,721,000	[2]	25,670,000	[2]	17,795,000	[2]
Interest Expense	4,614,787		3,234,340		13,743,886		9,802,412
Other (Income) Expense, Net	(7,370,000)	[3]	275,000	[3]	(7,652,000)	[3]	(5,733,000)	[3]
Total expenses	5,257,000		9,230,000		31,762,000		21,865,000
Income Before Income Taxes	27,912,000		24,171,000		77,131,000		73,853,000
Total Assets	989,175,000		674,465,000		989,175,000		674,465,000
Electrical and Industrial Products [Member]
Operations and assets by segment
Net Sales	112,035,000		60,421,000		312,635,000		171,633,000
Operating Income	11,853,000	[1]	8,952,000	[1]	35,634,000	[1]	25,087,000	[1]
Total Assets	550,985,000		260,191,000		550,985,000		260,191,000
Galvanizing Services [Member]
Operations and assets by segment
Net Sales	85,720,000		89,254,000		258,077,000		258,570,000
Operating Income	21,316,000	[1]	24,449,000	[1]	73,260,000	[1]	70,631,000	[1]
Total Assets	383,560,000		359,694,000		383,560,000		359,694,000
Corporate [Member]
Operations and assets by segment
Total Assets	$ 54,630,000		$ 54,580,000		$ 54,630,000		$ 54,580,000

[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 gains or losses on sale of property, plant and equipment and other (income) expenses not specifically identifiable to a segment.