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Note 3 - Inventories (Tables)
 12 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule Of Inventory [Table Text Block]
   
Current
    
Long Term
    
Total
  
Raw materials
   $
168,640
     $
110,433
     $
279,073
  
Finished goods
    
32,383
      
618
      
33,001
  
    $
201,023
     $
111,051
     $
312,074
  
   
Current
    
Long Term
    
Total
  
Raw materials
   $
338,443
     $
56,611
     $
395,054
  
Finished goods
    
31,353
      
-
      
31,353
  
    $
369,796
     $
56,611
     $
426,407