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Note 6 - Inventories (Tables)
9 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 31,
2019
   
March 31,
2019
 
Raw materials
  $
1,139,246
    $
1,130,917
 
Work in process
   
1,906,679
     
2,325,238
 
Finished goods
   
1,113,817
     
808,721
 
Total inventories
  $
4,159,742
    $
4,264,876