Consolidated Statements of Changes in Equity (Unaudited) - USD ($)	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Parent [Member]	Noncontrolling Interest [Member]	Total
Beginning balance, value at May. 31, 2020	$ 5	$ 2,836	$ 53,790,764	$ (46,807,092)	$ 6,986,513	$ 1,173,020	$ 8,159,533
Begining balance, shares at May. 31, 2020	50,000	28,361,201
Cash distributions						(52,200)	(52,200)
Preferred dividends				(81,918)	(81,918)		(81,918)
Net income (loss)				942,119	942,119	67,039	1,009,158
Ending balance, value at Aug. 31, 2020	$ 5	$ 2,836	53,790,764	(45,946,891)	7,846,714	1,187,859	9,034,573
Ending balance, shares at Aug. 31, 2020	50,000	28,361,201
Beginning balance, value at May. 31, 2020	$ 5	$ 2,836	53,790,764	(46,807,092)	6,986,513	1,173,020	8,159,533
Begining balance, shares at May. 31, 2020	50,000	28,361,201
Net income (loss)							2,814,728
Ending balance, value at Feb. 28, 2021	$ 5	$ 2,836	53,790,764	(44,440,255)	9,353,350	1,220,338	10,573,688
Ending balance, shares at Feb. 28, 2021	50,000	28,361,201
Beginning balance, value at Aug. 31, 2020	$ 5	$ 2,836	53,790,764	(45,946,891)	7,846,714	1,187,859	9,034,573
Begining balance, shares at Aug. 31, 2020	50,000	28,361,201
Cash distributions						(52,200)	(52,200)
Preferred dividends				(81,918)	(81,918)		(81,918)
Net income (loss)				955,098	955,098	67,975	1,023,073
Ending balance, value at Nov. 30, 2020	$ 5	$ 2,836	53,790,764	(45,073,711)	8,719,894	1,203,634	9,923,528
Ending balance, shares at Nov. 30, 2020	50,000	28,361,201
Cash distributions						(52,200)	(52,200)
Preferred dividends				(80,137)	(80,137)		(80,137)
Net income (loss)				713,593	713,593	68,904	782,497
Ending balance, value at Feb. 28, 2021	$ 5	$ 2,836	53,790,764	(44,440,255)	9,353,350	1,220,338	10,573,688
Ending balance, shares at Feb. 28, 2021	50,000	28,361,201
Beginning balance, value at May. 31, 2021	$ 5	$ 2,836	53,790,764	(43,776,927)	10,016,678	1,236,362	11,253,040
Begining balance, shares at May. 31, 2021	50,000	28,361,201
Cash distributions						(52,200)	(52,200)
Preferred dividends				(81,918)	(81,918)		(81,918)
Net income (loss)				3,052,839	3,052,839	69,619	3,122,458
Stock options exercised		$ 20	23,980		24,000		24,000
Stock options exercised, shares		200,000
Ending balance, value at Aug. 31, 2021	$ 5	$ 2,856	53,814,744	(40,806,006)	13,011,599	1,253,781	14,265,380
Ending balance, shares at Aug. 31, 2021	50,000	28,561,201
Beginning balance, value at May. 31, 2021	$ 5	$ 2,836	53,790,764	(43,776,927)	10,016,678	1,236,362	11,253,040
Begining balance, shares at May. 31, 2021	50,000	28,361,201
Net income (loss)							3,496,217
Ending balance, value at Feb. 28, 2022	$ 5	$ 2,828	53,533,272	(40,732,392)	12,803,713	1,312,762	14,116,475
Ending balance, shares at Feb. 28, 2022	50,000	28,279,701
Beginning balance, value at Aug. 31, 2021	$ 5	$ 2,856	53,814,744	(40,806,006)	13,011,599	1,253,781	14,265,380
Begining balance, shares at Aug. 31, 2021	50,000	28,561,201
Preferred dividends				(81,027)	(81,027)		(81,027)
Net income (loss)				(297,817)	(297,817)	68,332	(229,485)
Ending balance, value at Nov. 30, 2021	$ 5	$ 2,856	53,814,744	(41,184,850)	12,632,755	1,322,113	13,954,868
Ending balance, shares at Nov. 30, 2021	50,000	28,561,201
Cash distributions						(80,000)	(80,000)
Preferred dividends				(80,137)	(80,137)		(80,137)
Net income (loss)				532,595	532,595	70,649	603,244
Common stock purchase		$ (28)	(281,472)		(281,500)		(281,500)
Common stock purchase, shares		(281,500)
Ending balance, value at Feb. 28, 2022	$ 5	$ 2,828	$ 53,533,272	$ (40,732,392)	$ 12,803,713	$ 1,312,762	$ 14,116,475
Ending balance, shares at Feb. 28, 2022	50,000	28,279,701