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Note 4 - Inventories (Tables)
12 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31
 
   
2019
   
2018
 
Raw materials
  $
1,130,917
    $
1,084,030
 
Work in process
   
2,325,238
     
1,828,492
 
Finished goods
   
808,721
     
737,917
 
Total inventories
  $
4,264,876
    $
3,650,439