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Note 8 - Inventories (Tables)
9 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31, 2018
   
December 31, 2018
 
Finished goods
  $
93,467
    $
95,022
 
Work in process
   
133,556
     
141,884
 
Raw materials
   
289,754
     
353,921
 
Total Inventories, net
  $
516,777
    $
590,827