Consolidated Statements of Earnings (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net sales	$ 136,448,786	$ 161,521,993
Costs and expenses:
Cost of products sold	122,047,302	143,915,520
Selling, general and administrative	5,314,971	5,491,737
Costs and Expenses, Total	127,362,273	149,407,257
Operating profit	9,086,513	12,114,736
Interest and other income	58,764	91,824
EARNINGS BEFORE INCOME TAXES	9,145,277	12,206,560
Income taxes:
Current	3,093,185	4,146,796
Deferred	(83,720)	(90,700)
Total	3,009,465	4,056,096
NET EARNINGS	$ 6,135,812	$ 8,150,464
Weighted average number of common shares outstanding:
Basic	6,799,444	6,799,444
Diluted	6,799,444	6,799,444
Net earnings per share:
Basic	$ 0.90	$ 1.20
Diluted	$ 0.90	$ 1.20