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Note 3 - Inventories (Tables)
 9 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule Of Inventory [Table Text Block]
   
Current
    
Long Term
    
Total
  
Raw materials
   $
489,860
     $
56,611
     $
546,471
  
Finished goods
    
11,086
      
-
      
11,086
  
    $
500,946
     $
56,611
     $
557,557
  
   
Current
    
Long Term
    
Total
  
Raw materials
   $
338,443
     $
56,611
     $
395,054
  
Finished goods
    
31,353
      
-
      
31,353
  
    $
369,796
     $
56,611
     $
426,407