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Stock Options And Stock-Based Compensation (Tables)
3 Months Ended
Aug. 31, 2020
Share-based Payment Arrangement [Abstract]  
Stock options outstanding
Outstanding Options   Exercisable Options
Number of Shares   Weighted Average Exercise Price   Weighted Average Remaining Contractual Life (yrs)   Number of Shares   Weighted Average Exercise Price
  22,500     $ 1.70       6.6       22,500     $ 1.70  
Stock option activity
    Three Months Ended
August 31, 2020
    Number of Shares   Weighted Average Exercise Price   Weighted Average Remaining Contractual Term (yrs)   Aggregate Intrinsic Value
Options outstanding and exercisable - May 31, 2020     22,500     $ 1.70       6.9     $ 38,250  
Options granted                        
Options exercised                        
Options forfeited/canceled                        
Options outstanding and exercisable - August 31, 2020     22,500     $ 1.70       6.6     $ 38,250  
Schedule of share-based compensation, restricted stock units award activity
    Number of Units   Weighted Average Price at Grant Date   Aggregate Intrinsic Value
Non-vested restricted stock units - May 31, 2020     55,147     $ 3.28     $ 180,882  
Restricted stock units granted     25,922       3.71       96,234  
Restricted stock units vested     (40,031 )     3.26       (130,572 )
Non-vested restricted stock units - August 31, 2020     41,038     $ 3.57     $ 146,544