Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 2017
Income Statement [Abstract]
Sales	$ 12,064,651	$ 8,693,851	$ 32,073,828	$ 25,759,823
Cost of Sales	10,349,347	6,234,807	27,325,588	21,103,691
Gross Profit	1,715,304	2,459,044	4,748,240	4,656,132
General, Selling and Administrative Expenses	724,748	745,924	2,177,164	2,133,228
Operating Income	990,556	1,713,120	2,571,076	2,522,904
Other Income (Expense):
Other income (expense)	(6,202)		5,867
Interest expense	(339,208)	(290,087)	(997,944)	(832,887)
Income before Income Taxes	645,146	1,423,033	1,578,999	1,690,017
Provision for Income Taxes	639,600	502,150	899,100	556,700
Net Income	5,546	920,883	679,899	1,133,317
Income Attributable to Variable Interest Entity	(62,552)	(60,914)	(185,520)	(180,466)
Preferred Dividends	(95,548)	(86,302)	(283,562)	(255,514)
Net Income (Loss) Attributable to Common Stockholders	$ (152,554)	$ 773,667	$ 210,817	$ 697,337
Income (Loss) Per Share of Common Stock - Basic and Diluted	$ (0.01)	$ 0.03	$ 0.01	$ 0.02
Weighted Average Shares of Common Stock Outstanding - Basic	28,361,201	28,361,201	28,361,201	28,309,003
Weighted Average Shares of Common Stock Outstanding - Diluted	28,361,201	28,935,114	28,992,153	28,888,170