Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2017	Nov. 30, 2016
Income Statement [Abstract]
Sales	$ 9,722,102	$ 9,221,711	$ 20,009,177	$ 17,065,972
Cost of Sales	8,588,065	7,992,441	16,976,241	14,868,884
Gross Profit	1,134,037	1,229,270	3,032,936	2,197,088
General, Selling and Administrative Expenses	621,013	664,275	1,452,416	1,387,304
Operating Income	513,024	564,995	1,580,520	809,784
Other Income (Expense):
Other income	3,806		12,069
Interest expense	(334,059)	(306,169)	(658,736)	(542,800)
Income before Income Taxes	182,771	258,826	933,853	266,984
Provision for Income Taxes	38,700	73,400	259,500	54,550
Net Income	144,071	185,426	674,353	212,434
Income Attributable to Variable Interest Entity	(61,915)	(60,173)	(122,968)	(119,552)
Preferred Dividends	(93,493)	(84,144)	(188,014)	(169,212)
Net Income (Loss) Attributable to Common Stockholders	$ (11,337)	$ 41,109	$ 363,371	$ (76,330)
Income (Loss) Per Share of Common Stock - Basic and Diluted	$ (0.00)	$ 0.00	$ 0.01	$ (0.00)
Weighted Average Shares of Common Stock Outstanding - Basic	28,361,201	28,361,201	28,361,201	28,283,332
Weighted Average Shares of Common Stock Outstanding - Diluted	28,361,201	28,940,368	28,988,701	28,283,332