Condensed Consolidated Statements of Shareholders 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
Stock Issued During Period, Value, Employee Stock Purchase Plan	9	3,729
Stock Issued During Period, Value, Employee Benefit Plan	75	25,470		$ 25,545
Stockholders' Equity Attributable to Parent, Ending Balance at Aug. 31, 2020	101,027	9,837,979	32,714,591
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition		49,717
Net Income (Loss) Attributable to Parent			176,011
Treasury Stock, Value at May. 31, 2020				(2,861,032)
Stock Issued During Period, Value, Employee Benefit Plan	(75)	(25,470)		(25,545)
Treasury Stock, Value at Aug. 31, 2020				(2,886,577)
Stockholders' Equity Attributable to Parent	101,027	9,837,979	32,714,591
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
Stock Issued During Period, Value, Employee Stock Purchase Plan	8	3,825
Stock Issued During Period, Value, Employee Benefit Plan	0	0		0
Stockholders' Equity Attributable to Parent, Ending Balance at Aug. 31, 2021	101,313	10,014,255	33,783,352
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition		0
Net Income (Loss) Attributable to Parent			181,877
Treasury Stock, Value at May. 31, 2021				(2,915,002)
Stock Issued During Period, Value, Employee Benefit Plan	0	0		0
Treasury Stock, Value at Aug. 31, 2021				$ (2,915,002)
Stockholders' Equity Attributable to Parent	$ 101,313	$ 10,014,255	$ 33,783,352