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Note 4 - Inventories (Tables)
12 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31
 
   
2020
   
2019
 
Raw materials
  $
1,017,451
    $
1,130,917
 
Work in process
   
1,863,000
     
2,325,238
 
Finished goods
   
1,003,999
     
808,721
 
Total inventories
  $
3,884,450
    $
4,264,876