Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016
Income Statement [Abstract]
Sales	$ 8,693,851	$ 5,280,480	$ 25,759,823	$ 15,270,671
Cost of Sales	6,234,807	4,574,839	21,103,691	12,743,989
Gross Profit	2,459,044	705,641	4,656,132	2,526,682
General, Selling and Administrative Expenses	745,924	601,106	2,133,228	1,840,574
Operating Income	1,713,120	104,535	2,522,904	686,108
Other Expense:
Interest expense	(290,087)	(232,105)	(832,887)	(619,481)
Income before Income Taxes	1,423,033	(127,570)	1,690,017	66,627
Provision for (Benefit from) Income Taxes	502,150	(67,750)	556,700	(39,100)
Net Income	920,883	(59,820)	1,133,317	105,727
Income Attributable to Variable Interest Entities	(60,914)	(58,912)	(180,466)	(175,249)
Preferred Dividends	(86,302)	(81,796)	(255,514)	(244,741)
Net Income (Loss) Attributable to Common Stockholders	$ 773,667	$ (200,528)	$ 697,337	$ (314,263)
Income (Loss) Per Share of Common Stock - Basic and Diluted	$ 0.03	$ (0.01)	$ 0.02	$ (0.01)
Weighted Average Shares of Common Stock Outstanding - Basic	28,361,201	27,886,201	28,309,003	27,640,033
Weighted Average Shares of Common Stock Outstanding - Diluted	28,935,114	27,886,201	28,888,170	27,640,033