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	$ 100,735	$ 9,538,892	$ 29,508,604
Stockholders' Equity Attributable to Parent, Beginning Balance at May. 31, 2019	100,735	9,538,892	29,508,604
Stock Issued During Period, Value, Employee Stock Purchase Plan	16	6,837
Stock Issued During Period, Value, Employee Benefit Plan
Stockholders' Equity Attributable to Parent, Ending Balance at Nov. 30, 2019	100,751	9,601,166	30,780,187
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition		55,437
Net Income (Loss) Attributable to Parent			1,271,583
Treasury Stock, Value, Beginning Balance at May. 31, 2019				(2,829,359)
Treasury Stock, Value, Ending Balance at Nov. 30, 2019				(2,829,359)
Stockholders' Equity Attributable to Parent	100,751	9,601,166	30,780,187
Stockholders' Equity Attributable to Parent	100,743	9,597,698	29,863,181
Stockholders' Equity Attributable to Parent, Beginning Balance at Aug. 31, 2019	100,743	9,597,698	29,863,181
Stock Issued During Period, Value, Employee Stock Purchase Plan	8	3,468
Stock Issued During Period, Value, Employee Benefit Plan
Stockholders' Equity Attributable to Parent, Ending Balance at Nov. 30, 2019	100,751	9,601,166	30,780,187
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition
Net Income (Loss) Attributable to Parent			917,006
Treasury Stock, Value, Beginning Balance at Aug. 31, 2019				(2,829,359)
Treasury Stock, Value, Ending Balance at Nov. 30, 2019				(2,829,359)
Stockholders' Equity Attributable to Parent	100,751	9,601,166	30,780,187
Stockholders' Equity Attributable to Parent	100,751	9,601,166	30,780,187
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	19	7,362
Stock Issued During Period, Value, Employee Benefit Plan	75	25,470		(25,545)
Stockholders' Equity Attributable to Parent, Ending Balance at Nov. 30, 2020	101,037	9,841,612	33,359,881
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition		49,717
Net Income (Loss) Attributable to Parent			821,301
Treasury Stock, Value, Beginning Balance at May. 31, 2020				(2,861,032)
Treasury Stock, Value, Ending Balance at Nov. 30, 2020				(2,886,577)
Stockholders' Equity Attributable to Parent	101,037	9,841,612	33,359,881
Stockholders' Equity Attributable to Parent	101,027	9,837,979	32,714,591
Stockholders' Equity Attributable to Parent, Beginning Balance at Aug. 31, 2020	101,027	9,837,979	32,714,591
Stock Issued During Period, Value, Employee Stock Purchase Plan	10	3,633
Stock Issued During Period, Value, Employee Benefit Plan
Stockholders' Equity Attributable to Parent, Ending Balance at Nov. 30, 2020	101,037	9,841,612	33,359,881
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition
Net Income (Loss) Attributable to Parent			645,290
Treasury Stock, Value, Beginning Balance at Aug. 31, 2020				(2,886,577)
Treasury Stock, Value, Ending Balance at Nov. 30, 2020				$ (2,886,577)
Stockholders' Equity Attributable to Parent	101,037	9,841,612	33,359,881
Stockholders' Equity Attributable to Parent	$ 101,037	$ 9,841,612	$ 33,359,881