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Notes to Condensed Consolidated Financial Statements (Tables)
6 Months Ended
Nov. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Inventory
       
   November 30, 2020  May 31, 2020
Raw materials  $580,276   $658,024 
Work-in-process   7,844,831    8,586,404 
Finished goods   542,726    963,009 
Gross inventory   8,967,833    10,207,437 
Less allowance for obsolescence   100,000    100,000 
Net inventory  $8,867,833   $10,107,437