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Note 6 - Inventories (Tables)
6 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
September 30,
2019
   
March 31,
2019
 
Raw materials
  $
1,127,683
    $
1,130,917
 
Work in process
   
2,282,261
     
2,325,238
 
Finished goods
   
945,388
     
808,721
 
Total inventories
  $
4,355,332
    $
4,264,876