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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 24 10,209    
Stock Issued During Period, Value, Employee Benefit Plan  
Stockholders' Equity Attributable to Parent, Ending Balance at Feb. 29, 2020 100,759 9,604,538 31,562,939  
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition   55,437    
Net Income (Loss) Attributable to Parent     2,054,335  
Treasury Stock, Value, Beginning Balance at May. 31, 2019       (2,829,359)
Treasury Stock, Value, Ending Balance at Feb. 29, 2020       (2,829,359)
Stockholders' Equity Attributable to Parent 100,759 9,604,538 31,562,939  
Stockholders' Equity Attributable to Parent 100,751 9,601,166 30,780,187  
Stockholders' Equity Attributable to Parent, Beginning Balance at Nov. 30, 2019 100,751 9,601,166 30,780,187  
Stock Issued During Period, Value, Employee Stock Purchase Plan 8 3,372    
Stock Issued During Period, Value, Employee Benefit Plan  
Stockholders' Equity Attributable to Parent, Ending Balance at Feb. 29, 2020 100,759 9,604,538 31,562,939  
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition      
Net Income (Loss) Attributable to Parent     782,752  
Treasury Stock, Value, Beginning Balance at Nov. 30, 2019       (2,829,359)
Treasury Stock, Value, Ending Balance at Feb. 29, 2020       (2,829,359)
Stockholders' Equity Attributable to Parent 100,759 9,604,538 31,562,939  
Stockholders' Equity Attributable to Parent 100,759 9,604,538 31,562,939  
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 29 11,382    
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  
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition   49,717    
Net Income (Loss) Attributable to Parent     1,003,619  
Treasury Stock, Value, Beginning Balance at May. 31, 2020       (2,861,032)
Treasury Stock, Value, Ending Balance 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 101,037 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  
Stock Issued During Period, Value, Employee Stock Purchase Plan 10 4,020    
Stock Issued During Period, Value, Employee Benefit Plan  
Stockholders' Equity Attributable to Parent, Ending Balance at Feb. 28, 2021 101,047 9,845,632 33,542,199  
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition      
Net Income (Loss) Attributable to Parent     182,318  
Treasury Stock, Value, Beginning Balance at Nov. 30, 2020       (2,886,577)
Treasury Stock, Value, Ending Balance 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 $ 101,047 $ 9,845,632 $ 33,542,199