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Note 6 - Inventories
9 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
Inventory Disclosure [Text Block]
 
NOTE
6.
INVENTORIES
 
Inventories are shown in the following table:
 
   
December 31,
2018
   
March 31,
2018
 
Raw materials
  $
1,155,148
    $
1,084,030
 
Work in process
   
2,265,585
     
1,828,492
 
Finished goods
   
720,748
     
737,917
 
Total inventories
  $
4,141,481
    $
3,650,439