Condensed Consolidated Statements of Operations (USD $)	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Net sales	$ 31,719,922	$ 36,987,260	$ 104,488,762	$ 117,961,998
Costs and expenses
Costs of goods sold	28,835,644	33,054,379	93,179,930	104,985,889
General, selling and administrative costs	1,183,507	1,244,548	4,065,890	4,090,794
Costs and Expenses, Total	30,019,151	34,298,927	97,245,820	109,076,683
Interest and other income	(15,530)	(15,250)	(43,264)	(48,372)
Earnings before income taxes	1,716,301	2,703,583	7,286,206	8,933,687
Provision for (benefit from) income taxes:
Current	587,173	927,008	2,469,478	3,056,143
Deferred	(20,930)	(22,675)	(69,513)	(68,025)
Income Tax Expense (Benefit), Total	566,243	904,333	2,399,965	2,988,118
Net earnings	$ 1,150,058	$ 1,799,250	$ 4,886,241	$ 5,945,569
Weighted average number of common shares outstanding:
Basic	6,799,444	6,799,444	6,799,444	6,799,444
Diluted	6,799,444	6,799,444	6,799,444	6,799,444
Net earnings per share:
Basic	$ 0.17	$ 0.26	$ 0.72	$ 0.87
Diluted	$ 0.17	$ 0.26	$ 0.72	$ 0.87
Cash dividends declared per common share	$ 0.63	$ 0.13	$ 0.89	$ 0.39