Consolidated Statements of Operations (Income) (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018
Income Statement [Abstract]
Sales	$ 17,224,467	$ 12,064,651	$ 50,163,707	$ 32,073,828
Cost of Sales	15,455,920	10,349,347	44,257,438	27,325,588
Gross Profit	1,768,547	1,715,304	5,906,269	4,748,240
General, Selling and Administrative Expenses	959,288	724,748	2,752,029	2,177,164
Operating Income	809,259	990,556	3,154,240	2,571,076
Other Income (Expense):
Other income	2,438	(6,202)	7,728	5,867
Interest expense	(499,967)	(339,208)	(1,348,285)	(997,944)
Income before Income Taxes	311,730	645,146	1,813,683	1,578,999
Provision for Income Taxes	80,300	639,600	520,400	899,100
Net Income	231,430	5,546	1,293,283	679,899
Income Attributable to Non-controlling Interest	(64,093)	(62,552)	(187,620)	(185,520)
Preferred Dividends	(108,219)	(95,548)	(316,264)	(283,562)
Net Income (Loss) Attributable to Common Stockholders	$ 59,118	$ (152,554)	$ 789,399	$ 210,817
Income (Loss) Per Share of Common Stock - Basic and Diluted	$ 0.00	$ (0.01)	$ 0.03	$ 0.01
Weighted Average Shares of Common Stock Outstanding - Basic	28,361,201	28,361,201	28,361,201	28,361,201
Weighted Average Shares of Common Stock Outstanding - Diluted	29,012,048	28,361,201	29,009,415	28,992,153