Condensed Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2012	Nov. 30, 2011
Income Statement [Abstract]
Net Sales	$ 149,674,616	$ 116,492,703	$ 430,202,771	$ 345,486,904
Costs and Expenses
Cost of Sales	104,671,793	85,685,729	304,022,422	253,230,966
Selling, General and Administrative	17,894,549	11,320,064	49,019,008	36,109,841
Interest Expense	3,234,340	3,518,978	9,802,412	10,453,156
Net Loss (Gain) On Sale of Property, Plant and Equipment, and Insurance Proceeds	157,065	(7,101)	(5,794,623)	163,777
Other Expense (Income) - net	(453,853)	(192,569)	(700,074)	(1,224,927)
Total costs and expenses	125,503,894	100,325,101	356,349,145	298,732,813
Income Before Income Taxes	24,170,722	16,167,602	73,853,626	46,754,091
Income Tax Expense	8,807,042	6,146,684	26,631,069	17,661,951
Net Income	$ 15,363,680	$ 10,020,918	$ 47,222,557	$ 29,092,140
Earnings Per Common Share
Basic Earnings Per Share (usd per share)	$ 0.61	$ 0.40	$ 1.87	$ 1.16
Diluted Earnings Per Share (usd per share)	$ 0.60	$ 0.39	$ 1.85	$ 1.15