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Notes to Condensed Consolidated Financial Statements (Tables)
3 Months Ended
Aug. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Inventory
         
  August 31, 2020   May 31, 2020
Raw materials   $ 637,444     $ 658,024  
Work-in-process     8,472,445       8,586,404  
Finished goods     540,503       963,009  
Gross inventory     9,650,392       10,207,437  
Less allowance for obsolescence     100,000       100,000  
Net inventory   $ 9,550,392     $ 10,107,437