Condensed Consolidated Statements of Operations (USD $)	3 Months Ended		9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Net sales	$ 28,274,696	$ 31,719,922	$ 84,167,208	$ 104,488,762
Costs and expenses
Costs of goods sold	26,427,918	28,835,644	78,798,672	93,179,930
General, selling and administrative costs	1,121,986	1,183,507	3,472,545	4,065,890
Costs and Expenses, Total	27,549,904	30,019,151	82,271,217	97,245,820
Interest and other income	(15,501)	(15,530)	(46,508)	(43,264)
Earnings before income taxes	740,293	1,716,301	1,942,499	7,286,206
Provision for (benefit from) income taxes:
Current	275,970	587,173	768,149	2,469,478
Deferred	(23,145)	(20,930)	(149,136)	(69,513)
Income Tax Expense (Benefit), Total	252,825	566,243	619,013	2,399,965
Net earnings	$ 487,468	$ 1,150,058	$ 1,323,486	$ 4,886,241
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	$ 0.07	$ 0.17	$ 0.19	$ 0.72
Diluted	$ 0.07	$ 0.17	$ 0.19	$ 0.72
Cash dividends declared per common share	$ 0.02	$ 0.63	$ 0.18	$ 0.89