Consolidated Statements of Operations (USD $)	12 Months Ended
	May 31, 2013	May 31, 2012
Income Statement [Abstract]
Sales	$ 24,085,184	$ 24,157,590
Cost of Sales	18,828,452	19,227,739
Gross Profit	5,256,732	4,929,851
General, Selling and Administrative Expenses	2,189,125	1,992,679
Operating Income	3,067,607	2,937,172
Other Income (Expense):
Other income (expense)	6,500	(133,409)
Interest expense	(828,897)	(897,113)
Total Other Expense, net	(822,397)	(1,030,522)
Income before Income Taxes	2,245,210	1,906,650
Benefit from Income Taxes	548,000	585,000
Net Income	2,793,210	2,491,650
Income Attributable to Variable Interest Entities, net	(201,552)	(146,190)
Preferred Dividends	(326,781)	(242,192)
Net Income Attributable to Common Stockholders	$ 2,264,877	$ 2,103,268
Income Per Share of Common Stock -
Basic	$ 0.09	$ 0.08
Diluted	$ 0.08	$ 0.08
Weighted Average Shares of Common Stock Outstanding -
Basic	26,111,201	26,111,201
Diluted	27,480,039	26,111,201