Segments (Details) (USD $)	3 Months Ended				6 Months Ended
	Aug. 31, 2014 segment		Aug. 31, 2013		Aug. 31, 2014		Aug. 31, 2013		Feb. 28, 2014
Segment Reporting Information [Line Items]
Number of operating segments	2
Operations and assets by segment
Net Sales	$ 193,415,643		$ 189,782,229		$ 409,542,035		$ 372,956,848
Operating Income	22,956,438		29,726,435		50,803,890		53,754,560
General Corporate Expense	(1,067,910)	[1]	7,186,550	[1]	6,824,641	[1]	17,657,794	[1]
Interest Expense	4,223,791		4,651,412		8,432,336		9,129,099
Other (Income) Expense, Net	26,034	[2]	(677,260)	[2]	30,787	[2]	(4,481,507)	[2]
Total expenses	3,181,915		11,160,702		15,287,764		22,305,386
Income Before Income Taxes	18,712,197		25,817,159		42,408,716		49,218,975
Assets	969,787,785		983,816,015		969,787,785		983,816,015		953,253,035
Electrical and Industrial Products [Member]
Operations and assets by segment
Net Sales	100,559,476		104,134,125		231,080,646		200,599,522
Operating Income	(1,118,881)	[3]	10,733,353	[3]	12,693,033	[3]	23,781,037	[3]
Assets	530,535,476		560,156,224		530,535,476		560,156,224
Galvanizing Services [Member]
Operations and assets by segment
Net Sales	92,856,167		85,648,104		178,461,389		172,357,326
Operating Income	23,012,993	[3]	26,244,508	[3]	45,003,447	[3]	47,743,324	[3]
Assets	387,392,923		379,827,868		387,392,923		379,827,868
Operating Segments [Member]
Operations and assets by segment
Operating Income	21,894,112	[3]	36,977,861	[3]	57,696,480	[3]	71,524,361	[3]
Corporate [Member]
Operations and assets by segment
Assets	$ 51,859,386		$ 43,831,923		$ 51,859,386		$ 43,831,923

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

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

[3] 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.