Consolidated Statements of Income - USD ($)	12 Months Ended
	May 31, 2016	May 31, 2015
Income Statement [Abstract]
Sales	$ 26,340,405	$ 22,293,922
Cost of Sales	21,591,039	18,269,192
Gross Profit	4,749,366	4,024,730
General, Selling and Administrative Expenses	2,555,249	2,168,762
Operating Income	2,194,117	1,855,968
Other Income (Expense):
Other income		2,500
Interest expense	(862,428)	(818,136)
Total Other Expense, net	(862,428)	(815,636)
Income before Income Taxes	1,331,689	1,040,332
Provision for Income Taxes	(495,555)	(430,763)
Net Income	836,134	609,569
Income Attributable to Variable Interest Entity	(232,833)	(227,004)
Preferred Dividends	(331,575)	(325,000)
Net Income Attributable to Common Stockholders	$ 271,726	$ 57,565
Income Per Share of Common Stock -
Basic and Diluted	$ 0.01	$ 0.00
Weighted Average Shares of Common Stock Outstanding -
Basic	27,701,911	26,975,312
Diluted	28,042,200	27,771,466