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Notes to Condensed Consolidated Financial Statements (Tables)
3 Months Ended
Aug. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Inventory
       
   August 31, 2021  May 31, 2021
Raw materials  $595,406   $503,344 
Work-in-process   4,771,180    5,076,377 
Finished goods   201,147    355,875 
Gross inventory   5,567,733    5,935,596 
Less allowance for obsolescence   100,000    100,000 
Net inventory  $5,467,733   $5,835,596