Condensed Consolidated Statements of Stockholders Equity - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]
Stockholders' Equity Attributable to Parent	$ 100,943	$ 9,759,063	$ 32,538,580
Stockholders' Equity Attributable to Parent, Beginning Balance at May. 31, 2020	100,943	9,759,063	32,538,580
Treasury Stock, Value at May. 31, 2020				$ (2,861,032)
Stock Issued During Period, Value, Employee Stock Purchase Plan	29	11,382
Stock Issued During Period, Value, Employee Benefit Plan	75	25,470		25,545
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition		49,717
Net Income (Loss) Attributable to Parent			1,003,619
Stock Issued During Period, Value, Employee Benefit Plan	(75)	(25,470)		(25,545)
Stockholders' Equity Attributable to Parent, Ending Balance at Feb. 28, 2021	101,047	9,845,632	33,542,199
Treasury Stock, Value at Feb. 28, 2021				(2,886,577)
Stockholders' Equity Attributable to Parent	101,037	9,841,612	33,359,881
Stockholders' Equity Attributable to Parent, Beginning Balance at Nov. 30, 2020	101,037	9,841,612	33,359,881
Treasury Stock, Value at Nov. 30, 2020				(2,886,577)
Stock Issued During Period, Value, Employee Stock Purchase Plan	10	4,020
Stock Issued During Period, Value, Employee Benefit Plan	0	0		0
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition		0
Net Income (Loss) Attributable to Parent			182,318
Stock Issued During Period, Value, Employee Benefit Plan	0	0		0
Stockholders' Equity Attributable to Parent, Ending Balance at Feb. 28, 2021	101,047	9,845,632	33,542,199
Treasury Stock, Value at Feb. 28, 2021				(2,886,577)
Stockholders' Equity Attributable to Parent	101,047	9,845,632	33,542,199
Stockholders' Equity Attributable to Parent	101,305	10,010,430	33,601,475
Stockholders' Equity Attributable to Parent, Beginning Balance at May. 31, 2021	101,305	10,010,430	33,601,475
Treasury Stock, Value at May. 31, 2021				(2,915,002)
Stock Issued During Period, Value, Employee Stock Purchase Plan	27	12,308
Stock Issued During Period, Value, Employee Benefit Plan	0	0		0
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition		125,764
Net Income (Loss) Attributable to Parent			724,388
Stock Issued During Period, Value, Employee Benefit Plan	0	0		0
Stockholders' Equity Attributable to Parent, Ending Balance at Feb. 28, 2022	101,332	10,148,502	34,325,863
Treasury Stock, Value at Feb. 28, 2022				(2,915,002)
Stockholders' Equity Attributable to Parent	101,323	10,144,275	34,443,156
Stockholders' Equity Attributable to Parent, Beginning Balance at Nov. 30, 2021	101,323	10,144,275	34,443,156
Treasury Stock, Value at Nov. 30, 2021				(2,915,002)
Stock Issued During Period, Value, Employee Stock Purchase Plan	9	4,227
Stock Issued During Period, Value, Employee Benefit Plan	0	0		0
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition		0
Net Income (Loss) Attributable to Parent			(117,293)
Stock Issued During Period, Value, Employee Benefit Plan	0	0		0
Stockholders' Equity Attributable to Parent, Ending Balance at Feb. 28, 2022	101,332	10,148,502	34,325,863
Treasury Stock, Value at Feb. 28, 2022				$ (2,915,002)
Stockholders' Equity Attributable to Parent	$ 101,332	$ 10,148,502	$ 34,325,863