Consolidated Statements of Changes inEquity - 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						(208,800)	(208,800)
Preferred dividends, $6.57 per share				(323,219)	(323,219)		(323,219)
Net income				3,353,384	3,353,384	272,142	$ 3,625,526
Stock options exercised, shares
Ending balance, value at May. 31, 2021	$ 5	$ 2,836	53,790,764	(43,776,927)	10,016,678	1,236,362	$ 11,253,040
Ending balance, shares at May. 31, 2021	50,000	28,361,201
Cash distributions						(132,200)	(132,200)
Preferred dividends, $6.57 per share				(328,459)	(328,459)		(328,459)
Net income				4,266,937	4,266,937	279,663	4,546,600
Stock options exercised		$ 20	23,980		24,000		$ 24,000
Stock options exercised, shares		200,000					200,000
Common stock purchase		$ (28)	(281,472)		(281,500)		$ (281,500)
Common stock purchase, shares		(281,500)
Ending balance, value at May. 31, 2022	$ 5	$ 2,828	$ 53,533,272	$ (39,838,449)	$ 13,697,656	$ 1,383,825	$ 15,081,481
Ending balance, shares at May. 31, 2022	50,000	28,279,701