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Notes to Condensed Consolidated Financial Statements (Tables)
3 Months Ended
Feb. 28, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Inventory
       
   February 28, 2021  May 31, 2020
Raw materials  $584,191   $658,024 
Work-in-process   7,583,386    8,586,404 
Finished goods   482,638    963,009 
Gross inventory   8,650,215    10,207,437 
Less allowance for obsolescence   100,000    100,000 
Net inventory  $8,550,215   $10,107,437