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Note 6 - Inventories (Tables)
9 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
Dec. 31,
2020
   
March 31,
2020
 
Raw materials
  $
839,102
    $
1,017,451
 
Work in process
   
1,959,692
     
1,863,000
 
Finished goods
   
1,043,683
     
1,003,999
 
Total inventories
  $
3,842,477
    $
3,884,450