Condensed Consolidated Statements of Earnings (USD $)	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Net Sales	$ 29,582,144	$ 39,434,770
Costs and expenses
Costs of goods sold	27,138,300	34,787,012
General, selling and administrative costs	1,304,900	1,559,836
Costs and Expenses, Total	28,443,200	36,346,848
Interest and other income	(15,506)	(12,208)
Earnings before income taxes	1,154,450	3,100,130
Income tax provision (benefit):
Current	448,936	1,035,928
Deferred	(102,845)	(27,652)
Income Tax Expense (Benefit), Total	346,091	1,008,276
Net earnings	$ 808,359	$ 2,091,854
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	$ 0.12	$ 0.31
Diluted	$ 0.12	$ 0.31
Cash dividends declared per common share	$ 0.08	$ 0.13