Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended
	Aug. 31, 2013	Aug. 31, 2012
Income Statement [Abstract]
Sales	$ 6,510,917	$ 7,128,866
Cost of Sales	4,365,545	5,604,017
Gross Profit	2,145,372	1,524,849
General, Selling and Administrative Expenses	596,313	558,639
Operating Income	1,549,059	966,210
Other Income (Expense):
Other income (expense)		10,000
Interest expense	(201,181)	(208,843)
Total Other Expense, net	(201,181)	(198,843)
Income before Income Taxes	1,347,878	767,367
Benefit from Income Taxes	237,000	199,400
Net Income	1,584,878	966,767
Loss (Income) Attributable to Variable Interest Entities, net	(54,308)	(51,954)
Preferred Dividends	(81,918)	(82,808)
Net Income Available to Common Stockholders	$ 1,448,652	$ 832,005
Income Available to Common Stockholders:
Per Share of Common Stock - Basic	$ 0.06	$ 0.03
Per Share of Common Stock - Diluted	$ 0.05	$ 0.03
Weighted Average Shares of Common Stock Outstanding -
Basic	26,111,201	26,111,201
Diluted	27,565,047	26,955,766