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Note 6 - Inventories (Tables)
3 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
June 30,
2018
   
March 31,
2018
 
Raw materials
  $
1,064,517
    $
1,084,030
 
Work in process
   
1,889,635
     
1,828,492
 
Finished goods
   
667,529
     
737,917
 
Total inventories
  $
3,621,681
    $
3,650,439