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Note 4 - Inventories (Tables)
12 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31
 
   
2021
   
2020
 
Raw materials
  $
660,678
    $
1,017,451
 
Work in process
   
2,220,723
     
1,863,000
 
Finished goods
   
1,019,376
     
1,003,999
 
Total inventories
  $
3,900,777
    $
3,884,450