Condensed Consolidated Statements of Operations (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net sales	$ 26,310,369	$ 33,334,070	$ 55,892,512	$ 72,768,840
Costs and expenses
Costs of goods sold	25,232,456	29,557,272	52,370,754	64,344,285
General, selling and administrative costs	1,045,656	1,322,549	2,350,559	2,882,384
Costs and Expenses, Total	26,278,112	30,879,821	54,721,313	67,226,669
Interest and other income	(15,500)	(15,527)	(31,007)	(27,734)
Earnings before income taxes	47,757	2,469,776	1,202,206	5,569,905
Provision for (benefit from) income taxes:
Current	43,243	846,377	492,179	1,882,305
Deferred	(23,145)	(20,930)	(125,991)	(48,583)
Income Tax Expense (Benefit), Total	20,098	825,447	366,188	1,833,722
Net earnings	$ 27,659	$ 1,644,329	$ 836,018	$ 3,736,183
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	$ 0.00	$ 0.24	$ 0.12	$ 0.55
Diluted	$ 0.00	$ 0.24	$ 0.12	$ 0.55
Cash dividends declared per common share	$ 0.08	$ 0.13	$ 0.16	$ 0.26