Consolidated Statements of Income - USD ($)	12 Months Ended
	May 31, 2019	May 31, 2018
Income Statement [Abstract]
Sales	$ 71,077,116	$ 48,609,075
Cost of Sales	62,837,214	41,570,319
Gross Profit	8,239,902	7,038,756
Selling, General and Administrative Expenses	3,922,284	3,034,027
Operating Income	4,317,618	4,004,729
Other Income (Expense):
Other income	11,560	12,144
Interest expense	(1,836,294)	(1,373,392)
Income before Income Taxes	2,492,884	2,643,481
Provision for Income Taxes	435,677	772,380
Net Income	2,057,207	1,871,101
Income Attributable to Non-controlling Interest	(252,116)	(247,039)
Preferred Dividends	(428,455)	(384,384)
Net Income Attributable to Common Stockholders	$ 1,376,636	$ 1,239,678
Income Per Share of Common Stock - Basic and Diluted	$ 0.05	$ 0.04
Weighted Average Shares of Common Stock Outstanding - Basic	28,361,201	28,361,201
Weighted Average Shares of Common Stock Outstanding - Diluted	29,009,415	28,993,110