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Note 5 - Inventories (Tables)
12 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31
 
   
2018
   
2017
 
Raw materials
  $
1,084,030
    $
786,775
 
Work in process
   
1,828,492
     
1,968,990
 
Finished goods
   
737,917
     
602,533
 
Total inventories
  $
3,650,439
    $
3,358,298