Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2013	Nov. 30, 2012
Income Statement [Abstract]
Sales	$ 4,361,490	$ 5,059,118	$ 10,872,407	$ 12,187,984
Cost of Sales	3,635,151	4,175,786	8,000,696	9,779,803
Gross Profit	726,339	883,332	2,871,711	2,408,181
General, Selling and Administrative Expenses	545,569	542,444	1,141,882	1,101,083
Operating Income	180,770	340,888	1,729,829	1,307,098
Other Income (Expense):
Other income (expense)	3,600	(3,500)	3,600	6,500
Interest expense	(197,094)	(210,511)	(398,275)	(419,354)
Total Other Expense, net	(193,494)	(214,011)	(394,675)	(412,854)
Income before Income Taxes	(12,724)	126,877	1,335,154	894,244
Benefit from Income Taxes		9,900	237,000	209,300
Net Income	(12,724)	136,777	1,572,154	1,103,544
Income Attributable to Variable Interest Entities, net	(56,875)	(52,256)	(111,183)	(104,210)
Preferred Dividends	(81,027)	(81,918)	(162,945)	(164,726)
Net Income Available to Common Stockholders	$ (150,626)	$ 2,603	$ 1,298,026	$ 834,608
Income Available to Common Stockholders:
Per Share of Common Stock - Basic and Diluted	$ (0.01)		$ 0.05	$ 0.03
Weighted Average Shares of Common Stock Outstanding -
Basic	26,111,201	26,111,201	26,111,201	26,111,201
Diluted	26,111,201	27,447,565	27,558,600	27,241,970